Proceedings of Meetings on Acoustics

Size: px
Start display at page:

Download "Proceedings of Meetings on Acoustics"

Transcription

1 Proceedings of Meetings on Acoustics Volume 19, ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Engineering Acoustics Session 1pEAb: Transduction, Transducers, and Energy Harvesting 1pEAb7. A new loudspeaker for low frequency radiation by linear motion type piezoelectric ultrasonic actuators Hiroya Saito*, Hirokazu NEGISHI, Juro OHGA, Ikuo OOHIRA, Kunio OISHI and Kazuaki Maeda *Corresponding author's address: Tokyo Univercity of Technology, Hachioji, , Tokyo, Japan, hirosaito12@gmail.com The authors had proposed new direct-radiator loudspeaker constructions with a conventional paper cone radiator driven by Ultrasonic Motors (=USM), as a substitution for voice-coil motor. However, those models needed a revolution to linear motion conversion mechanism, and avoiding zero region non linearity, like class A amplifier. These complications came from the conventional USM, since it is a rotational and having zero region non-linearity inherently. Here, the authors would propose a new mechanism by using new ultrasonic linear actuators, called Longitudinal-Bending Multilayered Transducers with Independent Electrodes (=LBMTIE). The beauty of LBMTIE is linear and to control vertical motion and horizontal motion independently, hence zero region non-linearity avoided. Therefore it is possible to substitute the voice-coil motor directly, which avoid the complicated mechanisms mentioned above. In this LBMTIE driven loudspeaker, vertical movement voltage be fixed and horizontal voltage is driven by audio signal, like voice-coil motor. In addition, there is a big contrast against conventional voice-coil motor, which is a typical transducer; as its electrical input and sound pressure output are direct proportion each other. This is because LBMTIE driven loudspeaker may behave a sort of modulator, which is not direct proportion in between input electric power and output sound pressure level. Published by the Acoustical Society of America through the American Institute of Physics 2013 Acoustical Society of America [DOI: / ] Received 21 Jan 2013; published 2 Jun 2013 Proceedings of Meetings on Acoustics, Vol. 19, (2013) Page 1

2 INTRODUCTION Personal computers or audio-video equipment, which are recently becoming prevalent, are required to include function of voice and music reproduction. Conventional audio reproduction systems for thus function are not sufficient to meet taste of recent users. Sound presence and very low frequency reproduction ability of them should be checked. Especially, low frequency characteristics of loudspeaker device must be improved. The conventional electrodynamic loudspeaker includes limitation of development in low frequency response, because driving force of electrodynamic transducer is induced indirectly, via an air gap. The authors propose a completely new loudspeaker construction by using piezoelectric ultrasonic actuators as a driver. The piezoelectric actuator is characterized by very high driving mechanical impedance because its mover contacts its stator tightly. THE LOUDSPEAKER BY ROTATIONAL TYPE PIEZOELECTRIC ULTRASONIC ACTUATOR The piezoelectric ultrasonic actuator was researched in the Union of Soviet Socialist Republics in the 1960s, and various types of it have been developed [1]. The piezoelectric ultrasonic actuator is being used for a driver of the autofocus mechanism of cameras, and position adjuster of a lens or a mirror for optical apparatus. The feature of a common piezoelectric ultrasonic actuator is -High response characteristic by direct drive. -Low speed and high torque, suitable for a direct controller. -Simple structure, suitable for miniature mechanism. -High controllability. These merits of the ultrasonic actuator are mainly due to a direct friction drive construction. FIGURE 1 shows a cut model of a rotationally type piezoelectric ultrasonic actuator. It is consisted by a circular metal mover and a metal ring stator. FIGURE 1. Structure of an ultrasonic actuator. Proceedings of Meetings on Acoustics, Vol. 19, (2013) Page 2

3 LOUDSPEAKER BY ROTATIONAL TYPE ULTRASONIC ACTUATOR FIGURE 2 shows a preliminary model of the loudspeaker examined by the authors, which is driven by a reciprocal motion of a rotational type ultrasonic actuator. As is described in FIGURE 3, this driving construction includes a conversion mechanism of rotation to linear motion. This experimental model induced too much wave distortion. It might be caused by friction characteristics of the rotation to linear motion conversion mechanism. In addition, combination of a spring and a sliding rail was less suitable to transfer driving force completely. FIGURE 2. The loudspeaker by rotation to linear conversion. FIGURE 3. Driving principle of the loudspeaker by rotation to linear conversion mechanism. LOUDSPEAKER BY LINEAR MOTION TYPE PIEZOELECTRIC ULTRASONIC ACTUATORS The authors developed a new loudspeaker with no conversion mechanism from rotational to linear motion. Linear motion piezoelectric ultrasonic actuator Driving principle of this motor is explained by FIGURE 4. This is one of predecessors in linear motion type piezoelectric ultrasonic actuator born in 1990 s, which configuration and motion are shown. Trajectory of the motion of tip top due to this vibration which is due to deformation of piezoelectric ceramic by an electric input, is on a small elliptical orbit, because the ceramic pear forms as a dual mode standing wave vibrator whose two vibrational modes are shown. One of intrinsic shortcoming for this model is linearity in near zero speed regions. As it has in active zone, which is source of sound distortion in loudspeaker. Proceedings of Meetings on Acoustics, Vol. 19, (2013) Page 3

4 Saito et al. FIGURE 4. Driving principle of composite vibration type ultrasonic actuator. FIGURE 5 shows the piezoelectric ultrasonic actuator driver construction developed by Dr. M. Takano et al. in Left hand drawing describes structure of multilayer piezoelectric ceramic driver, whereas right hand shows its photograph. Unlike the predecessor mentioned above, electrode for longitudinal vibration and bending vibration is independent each other. Then the difference of their characteristics will be explained in followings. FIGURE 5. Linear motion type piezoelectric ultrasonic actuator. FIGURE 6 shows that small rotational motion of the finger tip is induced by a composite of longitudinal vibration (L1) and bending vibration (B2) at the same near resonant frequency, of the piezoelectric ceramic rod having four divided electrodes. Its resonant frequencies of longitudinal extension vibration and transverse bending vibration of the ceramic are designed to be close frequency proximity. (b) B2 mode (a) L1 mode FIGURE 6. (a) L1 mode. (b) B2 mode. Proceedings of Meetings on Acoustics, Vol. 19, (2013) Page 4

5 FIGURE 7 describes relationship between applied voltage and velocity of the mover. Input-output linearity is excellent even very low input voltage region. Unlike the predecessor mentioned above, this model is very suitable for driving loudspeaker without distortion. FIGURE 7. Velocity characteristics. Driving circuit The multilayer piezoelectric actuator used here requires two sorts of ac voltages. One of them shall be modulated by audio signal as DSB(Double Side Band) wave form. FIGURE 8 describes a block diagram of the driving circuit developed by the authors. Four power amplifiers drive B2 and L1 electrodes by BTL connections. Signal for B2 is modulated by a multiplexer. Phase of signal for L1 is shifted by 90 degree to the signal for B2. FIGURE 8. Driving circuit block diagram. FIGURE 9 shows DSB signal waveform applied to B2 electrode. Proceedings of Meetings on Acoustics, Vol. 19, (2013) Page 5

6 FIGURE 9. DSB waveform. FIGURE 10 shows waveform to electrodes of 0 degree and 90 degree. FIGURE 10. Phase shift in 90 degree. EXPERIMENTAL MODEL The authors are examining a few experimental models. FIGURE 11 shows the first model of them. Left hand is schematic diagram and right one is photo. It is a direct radiator loudspeaker including 6 ultrasonic actuators to drive a paper cone, 46 cm in diameter. Output sound of this model still includes audio signal waveform distortion. The reason behind is assumed that the rigidity of slider support system is not enough, then one of such improvement is on going, which is explained in following. FIGURE 11. First experimental model FIGURE 12 shows the second experimental model the authors are developing now. This model is characterized by: The actuator chips are applied vertically. Contact point positions are adjustable. Proceedings of Meetings on Acoustics, Vol. 19, (2013) Page 6

7 FIGURE 12. Second experimental model As this model is still under construction, arrival of test motors and others are awaited. CONCLUSION In this paper, new loudspeakers using the linear ultrasonic actuators were proposed. Still it is in examination stage, yet the driving electronic circuit system was completed. The experimental results and characteristic of the newest model will be presented at the Congress. ACKNOWLEDGMENTS The authors wish to thank Prof. K. Nakamura of Tokyo Institute of Technology and Dr. M. Takano of Industrial Research Institute of Ishikawa for their valuable supports. REFERENCES 1. T. Kenjo, T. Sashida Introduction to ultrasonic motors, Sogo Denshi Pub. (Tokyo, Japan, 1991) [in Japanese]. 2. M. Takano, M. Takimoto, and K. Nakamura Electrode design of multilayered piezoelectric transducers for longitudinal-bending ultrasonic actuators, Acoust. Sci. & Tech. Vol. 32, No. 3, pp (2011). 3. J. Ohga Sound system with wideband piezoelectric rectangular loudspeakers using a tuck shaped PVDF bimorph, Proc. acoustics 2008, pp (Paris, France. June 29-July 4, 2008). 4. J. Ohga, R. Suzuki, K. Ishikawa, H. Negishi, I. Oohira, K. Maeda, H. Kubota Loudspeaker for low frequency signal driven by four piezoelectric ultrasonic motors, AES 132nd Conversion, No.0040 (Apr. 2012). 5. J. Ohga, Variety of electroacoustical devices by piezoelectric materials Is the loudspeaker without magnet nor coilpractical? -, Fundamentals Review, IEICE, 1, 4, pp (2008) [in Japanese]. Proceedings of Meetings on Acoustics, Vol. 19, (2013) Page 7

Proceedings of Meetings on Acoustics

Proceedings of Meetings on Acoustics Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Structural Acoustics and Vibration Session 5aSA: Applications in Structural

More information

Proceedings of Meetings on Acoustics

Proceedings of Meetings on Acoustics Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Engineering Acoustics Session 2pEAb: Controlling Sound Quality 2pEAb10.

More information

Proceedings of Meetings on Acoustics

Proceedings of Meetings on Acoustics Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Structural Acoustics and Vibration Session 5aSA: Applications in Structural

More information

Veröffentlichungen am IKFF PIEZOELECTRIC TRAVELLING WAVE MOTORS GENERATING DIRECT LINEAR MOTION

Veröffentlichungen am IKFF PIEZOELECTRIC TRAVELLING WAVE MOTORS GENERATING DIRECT LINEAR MOTION Veröffentlichungen am IKFF PIEZOELECTRIC TRAVELLING WAVE MOTORS GENERATING DIRECT LINEAR MOTION M. Hermann, W. Schinköthe (IKFF) Beitrag zur Actuator 96 Bremen 26. - 28.06.96 Conference Proceedings, S.

More information

19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, 2-7 SEPTEMBER 2007

19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, 2-7 SEPTEMBER 2007 19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, 2-7 SEPTEMBER 2007 LARGE CAPACITY ULTRASONIC COMPLEX VIBRATION SOURCES USING MULTIPLE TRANSDUCERS INTEGRATED USING A CIRCULAR VIBRATION DISK PACS: 43.55.Cs

More information

Electronic Instrumentation and Measurements

Electronic Instrumentation and Measurements Electronic Instrumentation and Measurements A fundamental part of many electromechanical systems is a measurement system that composed of four basic parts: Sensors Signal Conditioning Analog-to-Digital-Conversion

More information

CIRCULAR PHASED ARRAY PROBES FOR INSPECTION OF SUPERPHOENIX STEAM GENERATOR TUBES

CIRCULAR PHASED ARRAY PROBES FOR INSPECTION OF SUPERPHOENIX STEAM GENERATOR TUBES CIRCULAR PHASED ARRAY PROBES FOR INSPECTION OF SUPERPHOENIX STEAM GENERATOR TUBES G. Fleury, J. Poguet Imasonic S.A. France O. Burat, G Moreau Framatome France Abstract An ultrasonic Phased Array system

More information

Multi-spectral acoustical imaging

Multi-spectral acoustical imaging Multi-spectral acoustical imaging Kentaro NAKAMURA 1 ; Xinhua GUO 2 1 Tokyo Institute of Technology, Japan 2 University of Technology, China ABSTRACT Visualization of object through acoustic waves is generally

More information

Proceedings of Meetings on Acoustics

Proceedings of Meetings on Acoustics Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Signal Processing in Acoustics Session 1pSPa: Nearfield Acoustical Holography

More information

Self-oscillating Ultrasonic Micro-motor and It s Application

Self-oscillating Ultrasonic Micro-motor and It s Application Self-oscillating Ultrasonic Micro-motor and It s Application A. Iino*, K. Suzuki, M.Suzuki, K.Nitadori, M.Kasuga Seiko Instruments Inc. 8, Nakase 1-chome, Mihama-ku, Chiba-shi, Chiba 261-8507, Japan Abstract

More information

Presented at the 109th Convention 2000 September Los Angeles, California, USA

Presented at the 109th Convention 2000 September Los Angeles, California, USA Development of a Piezo-Electric Super Tweeter Suitable for DVD-Audio 5 Mitsukazu Kuze and Kazue Satoh Multimedia Development Center Matsushita Electric Industrial Co., Ltd. Kadoma-city, Osaka 57 l-8, Japan

More information

Applications of Piezoelectric Actuator

Applications of Piezoelectric Actuator MAMIYA Yoichi Abstract The piezoelectric actuator is a device that features high displacement accuracy, high response speed and high force generation. It has mainly been applied in support of industrial

More information

FLUTTER CONTROL OF WIND TUNNEL MODEL USING A SINGLE ELEMENT OF PIEZO-CERAMIC ACTUATOR

FLUTTER CONTROL OF WIND TUNNEL MODEL USING A SINGLE ELEMENT OF PIEZO-CERAMIC ACTUATOR 24 TH INTERNATIONAL CONGRESS OF THE AERONAUTICAL SCIENCES FLUTTER CONTROL OF WIND TUNNEL MODEL USING A SINGLE ELEMENT OF PIEZO-CERAMIC ACTUATOR Naoki Kawai Department of Mechanical Engineering, University

More information

The study on the woofer speaker characteristics due to design parameters

The study on the woofer speaker characteristics due to design parameters The study on the woofer speaker characteristics due to design parameters Byoung-sam Kim 1 ; Jin-young Park 2 ; Xu Yang 3 ; Tae-keun Lee 4 ; Hongtu Sun 5 1 Wonkwang University, South Korea 2 Wonkwang University,

More information

A Tutorial on Acoustical Transducers: Microphones and Loudspeakers

A Tutorial on Acoustical Transducers: Microphones and Loudspeakers A Tutorial on Acoustical Transducers: Microphones and Loudspeakers Robert C. Maher Montana State University EELE 217 Science of Sound Spring 2012 Test Sound Outline Introduction: What is sound? Microphones

More information

A STUDY ON NOISE REDUCTION OF AUDIO EQUIPMENT INDUCED BY VIBRATION --- EFFECT OF MAGNETISM ON POLYMERIC SOLUTION FILLED IN AN AUDIO-BASE ---

A STUDY ON NOISE REDUCTION OF AUDIO EQUIPMENT INDUCED BY VIBRATION --- EFFECT OF MAGNETISM ON POLYMERIC SOLUTION FILLED IN AN AUDIO-BASE --- A STUDY ON NOISE REDUCTION OF AUDIO EQUIPMENT INDUCED BY VIBRATION --- EFFECT OF MAGNETISM ON POLYMERIC SOLUTION FILLED IN AN AUDIO-BASE --- Masahide Kita and Kiminobu Nishimura Kinki University, Takaya

More information

Professor Emeritus, University of Tokyo, Tokyo, Japan Phone: ;

Professor Emeritus, University of Tokyo, Tokyo, Japan Phone: ; 17th World Conference on Nondestructive Testing, 25-28 Oct 2008, Shanghai, China New Ultrasonic Guided Wave Testing using Remote Excitation of Trapped Energy Mode Morio ONOE 1, Kenji OKA 2 and Takanobu

More information

Acoustic Projector Using Directivity Controllable Parametric Loudspeaker Array

Acoustic Projector Using Directivity Controllable Parametric Loudspeaker Array Proceedings of 20 th International Congress on Acoustics, ICA 2010 23-27 August 2010, Sydney, Australia Acoustic Projector Using Directivity Controllable Parametric Loudspeaker Array Shigeto Takeoka (1),

More information

ACOUSTIC AND ELECTROMAGNETIC EMISSION FROM CRACK CREATED IN ROCK SAMPLE UNDER DEFORMATION

ACOUSTIC AND ELECTROMAGNETIC EMISSION FROM CRACK CREATED IN ROCK SAMPLE UNDER DEFORMATION ACOUSTIC AND ELECTROMAGNETIC EMISSION FROM CRACK CREATED IN ROCK SAMPLE UNDER DEFORMATION YASUHIKO MORI 1, YOSHIHIKO OBATA 1 and JOSEF SIKULA 2 1) College of Industrial Technology, Nihon University, Izumi

More information

Investigating Electromagnetic and Acoustic Properties of Loudspeakers Using Phase Sensitive Equipment

Investigating Electromagnetic and Acoustic Properties of Loudspeakers Using Phase Sensitive Equipment Investigating Electromagnetic and Acoustic Properties of Loudspeakers Using Phase Sensitive Equipment Katherine Butler Department of Physics, DePaul University ABSTRACT The goal of this project was to

More information

Method of Determining Effect of Heat on Mortar by Using Aerial Ultrasonic Waves with Finite Amplitude

Method of Determining Effect of Heat on Mortar by Using Aerial Ultrasonic Waves with Finite Amplitude Proceedings of 20 th International Congress on Acoustics, ICA 2010 23-27 August 2010, Sydney, Australia Method of Determining Effect of Heat on Mortar by Using Aerial Ultrasonic Waves with Finite Amplitude

More information

Positioning Control System of a 3-Dimensional Ultrasonic Motor with Spherical Rotor

Positioning Control System of a 3-Dimensional Ultrasonic Motor with Spherical Rotor Second LACCEI International Latin American and Caribbean Conference for Engineering and Technology (LACCEI 2004) Challenges and Opportunities for Engineering Education, Research and Development 2-4 June

More information

An Ultrasonic Motor Using Bending Cylindrical Transducer Based On PZT Thin Film

An Ultrasonic Motor Using Bending Cylindrical Transducer Based On PZT Thin Film An Ultrasonic Motor Using Bending Cylindrical Transducer Based On PZT Thin Film Takeshi MORITA, Minoru KUROSAWA and Toshiro HIGUCHI Dept.of Precision Machinery Engineering, Faculty of Engineering, University

More information

System Inputs, Physical Modeling, and Time & Frequency Domains

System Inputs, Physical Modeling, and Time & Frequency Domains System Inputs, Physical Modeling, and Time & Frequency Domains There are three topics that require more discussion at this point of our study. They are: Classification of System Inputs, Physical Modeling,

More information

New Long Stroke Vibration Shaker Design using Linear Motor Technology

New Long Stroke Vibration Shaker Design using Linear Motor Technology New Long Stroke Vibration Shaker Design using Linear Motor Technology The Modal Shop, Inc. A PCB Group Company Patrick Timmons Calibration Systems Engineer Mark Schiefer Senior Scientist Long Stroke Shaker

More information

Lamb Wave Ultrasonic Stylus

Lamb Wave Ultrasonic Stylus Lamb Wave Ultrasonic Stylus 0.1 Motivation Stylus as an input tool is used with touchscreen-enabled devices, such as Tablet PCs, to accurately navigate interface elements, send messages, etc. They are,

More information

Proceedings of Meetings on Acoustics

Proceedings of Meetings on Acoustics Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Engineering Acoustics Session 1pEAb: Transduction, Transducers, and Energy

More information

Proceedings of Meetings on Acoustics

Proceedings of Meetings on Acoustics Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Engineering Acoustics Session 4pEAb: Fields and Devices 4pEAb3. Case

More information

Proceedings of Meetings on Acoustics

Proceedings of Meetings on Acoustics Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Physical Acoustics Session 4aPA: Nonlinear Acoustics I 4aPA8. Radiation

More information

5. Transducers Definition and General Concept of Transducer Classification of Transducers

5. Transducers Definition and General Concept of Transducer Classification of Transducers 5.1. Definition and General Concept of Definition The transducer is a device which converts one form of energy into another form. Examples: Mechanical transducer and Electrical transducer Electrical A

More information

Active Vibration Control in Ultrasonic Wire Bonding Improving Bondability on Demanding Surfaces

Active Vibration Control in Ultrasonic Wire Bonding Improving Bondability on Demanding Surfaces Active Vibration Control in Ultrasonic Wire Bonding Improving Bondability on Demanding Surfaces By Dr.-Ing. Michael Brökelmann, Hesse GmbH Ultrasonic wire bonding is an established technology for connecting

More information

The Naim Balanced Mode Radiator The Naim Ovator Bass Driver

The Naim Balanced Mode Radiator The Naim Ovator Bass Driver 1 The Naim Balanced Mode Radiator The Naim Ovator Bass Driver Lampos Ferekidis & Karl-Heinz Fink Fink Audio Consulting on behalf of Naim Audio Southampton Road, Salisbury SP1 2LN, ENGLAND The Balanced

More information

School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei, China 2

School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei, China 2 59 th ILMENAU SCIENTIFIC COLLOQUIUM Technische Universität Ilmenau, 11 15 September 2017 URN: urn:nbn:de:gbv:ilm1-2017iwk-009:9 Low-Frequency Micro/Nano-vibration Generator Using a Piezoelectric Actuator

More information

Ironless Loudspeakers with Ferrofluid Seals

Ironless Loudspeakers with Ferrofluid Seals Ironless Loudspeakers with Ferrofluid Seals Romain Ravaud, Guy Lemarquand, Valérie Lemarquand, Claude Dépollier To cite this version: Romain Ravaud, Guy Lemarquand, Valérie Lemarquand, Claude Dépollier.

More information

VIRTUAL FIGURE PRESENTATION USING PRESSURE- SLIPPAGE-GENERATION TACTILE MOUSE

VIRTUAL FIGURE PRESENTATION USING PRESSURE- SLIPPAGE-GENERATION TACTILE MOUSE VIRTUAL FIGURE PRESENTATION USING PRESSURE- SLIPPAGE-GENERATION TACTILE MOUSE Yiru Zhou 1, Xuecheng Yin 1, and Masahiro Ohka 1 1 Graduate School of Information Science, Nagoya University Email: ohka@is.nagoya-u.ac.jp

More information

1818. Evaluation of arbitrary waveform acoustic signal generation techniques in dispersive waveguides

1818. Evaluation of arbitrary waveform acoustic signal generation techniques in dispersive waveguides 1818. Evaluation of arbitrary waveform acoustic signal generation techniques in dispersive waveguides V. Augutis 1, D. Gailius 2, E. Vastakas 3, P. Kuzas 4 Kaunas University of Technology, Institute of

More information

A SHEAR WAVE TRANSDUCER ARRAY FOR REAL-TIME IMAGING. R.L. Baer and G.S. Kino. Edward L. Ginzton Laboratory Stanford University Stanford, CA 94305

A SHEAR WAVE TRANSDUCER ARRAY FOR REAL-TIME IMAGING. R.L. Baer and G.S. Kino. Edward L. Ginzton Laboratory Stanford University Stanford, CA 94305 A SHEAR WAVE TRANSDUCER ARRAY FOR REAL-TIME IMAGING R.L. Baer and G.S. Kino Edward L. Ginzton Laboratory Stanford University Stanford, CA 94305 INTRODUCTION In this paper we describe a contacting shear

More information

EQUIVALENT THROAT TECHNOLOGY

EQUIVALENT THROAT TECHNOLOGY EQUIVALENT THROAT TECHNOLOGY Modern audio frequency reproduction systems use transducers to convert electrical energy to acoustical energy. Systems used for the reinforcement of speech and music are referred

More information

Audio Spotlighting. Premkumar N Role Department of Electrical and Electronics, Belagavi, Karnataka, India.

Audio Spotlighting. Premkumar N Role Department of Electrical and Electronics, Belagavi, Karnataka, India. Audio Spotlighting Prof. Vasantkumar K Upadhye Department of Electrical and Electronics, Angadi Institute of Technology and Management Belagavi, Karnataka, India. Premkumar N Role Department of Electrical

More information

1. Introduction. 2. Concept. reflector. transduce r. node. Kraftmessung an verschiedenen Fluiden in akustischen Feldern

1. Introduction. 2. Concept. reflector. transduce r. node. Kraftmessung an verschiedenen Fluiden in akustischen Feldern 1. Introduction The aim of this Praktikum is to familiarize with the concept and the equipment of acoustic levitation and to measure the forces exerted by an acoustic field on small spherical objects.

More information

Three DOF parallel link mechanism utilizing smooth impact drive mechanism

Three DOF parallel link mechanism utilizing smooth impact drive mechanism Precision Engineering Journal of the International Societies for Precision Engineering and Nanotechnology 26 (2002) 289 295 Three DOF parallel link mechanism utilizing smooth impact drive mechanism Takeshi

More information

MEASUREMENT OF STRAIN AND POLARIZATION IN PIEZOELECTRIC AND ELECTROSTRICTIVE ACTUATORS

MEASUREMENT OF STRAIN AND POLARIZATION IN PIEZOELECTRIC AND ELECTROSTRICTIVE ACTUATORS 2 nd Canada-US CanSmart Workshop 1-11 October 22, Montreal, Quebec, Canada. MEASUREMENT OF STRAIN AND POLARIZATION IN PIEZOELECTRIC AND ELECTROSTRICTIVE ACTUATORS B. Yan, D. Waechter R. Blacow and S. E.

More information

Seal Mechanism of Tip Seal in Scroll Compressor

Seal Mechanism of Tip Seal in Scroll Compressor Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 214 Seal Mechanism of Tip Seal in Scroll Compressor Mitsuhiro Fukuta Shizuoka University,

More information

Changing the Shape of Sound... Again.

Changing the Shape of Sound... Again. 250 Crossways Park Drive, Woodbury, NY 11797 516.674.4INF (4463) Fax 516.682.3523 www.infinitysystems.com 2006 Harman International Industries, Incorporated.All rights reserved. Printed 5/06 Part No. CASCADELIT5/06

More information

A Novel Electromechanical Interrogation Scheme for Implantable Passive Transponders

A Novel Electromechanical Interrogation Scheme for Implantable Passive Transponders Purdue University Purdue e-pubs Birck and NCN Publications Birck Nanotechnology Center 1-29-212 A Novel Electromechanical Interrogation Scheme for Implantable Passive Transponders Albert Kim Birck Nanotechnology

More information

Acoustic Yagi Uda Antenna Using Resonance Tubes

Acoustic Yagi Uda Antenna Using Resonance Tubes Acoustic Yagi Uda Antenna Using Resonance Tubes Yuki TAMURA 1 ; Kohei YATABE 2 ; Yasuhiro OUCHI 3 ; Yasuhiro OIKAWA 4 ; Yoshio YAMASAKI 5 1 5 Waseda University, Japan ABSTRACT A Yagi Uda antenna gets high

More information

Metrology Prof.Dr Kanakuppi Sadashivappa Bapuji Institute of Engineering and Technology Davangere

Metrology Prof.Dr Kanakuppi Sadashivappa Bapuji Institute of Engineering and Technology Davangere Metrology Prof.Dr Kanakuppi Sadashivappa Bapuji Institute of Engineering and Technology Davangere Lecture 33 Electrical and Electronic Comparators, Optical comparators (Refer Slide Time: 00:17) I welcome

More information

MEASUREMENT OF SURFACE ACOUSTIC WAVE USING AIR COUPLED TRANSDUCER AND LASER DOPPLER VIBROMETER

MEASUREMENT OF SURFACE ACOUSTIC WAVE USING AIR COUPLED TRANSDUCER AND LASER DOPPLER VIBROMETER 21 st International Conference on Composite Materials Xi an, 20-25 th August 2017 MEASUREMENT OF SURFACE ACOUSTIC WAVE USING AIR COUPLED TRANSDUCER AND LASER DOPPLER VIBROMETER Weitao Yuan 1, Jinfeng Zhao

More information

Direction-Dependent Physical Modeling of Musical Instruments

Direction-Dependent Physical Modeling of Musical Instruments 15th International Congress on Acoustics (ICA 95), Trondheim, Norway, June 26-3, 1995 Title of the paper: Direction-Dependent Physical ing of Musical Instruments Authors: Matti Karjalainen 1,3, Jyri Huopaniemi

More information

Piezoelectric Generator for Powering Remote Sensing Networks

Piezoelectric Generator for Powering Remote Sensing Networks Piezoelectric Generator for Powering Remote Sensing Networks Moncef Benjamin. Tayahi and Bruce Johnson moncef@ee.unr.edu Contact Details of Author: Moncef Benjamin. Tayahi Phone: 775-784-6103 Fax: 775-784-6627

More information

POCKET DEFORMABLE MIRROR FOR ADAPTIVE OPTICS APPLICATIONS

POCKET DEFORMABLE MIRROR FOR ADAPTIVE OPTICS APPLICATIONS POCKET DEFORMABLE MIRROR FOR ADAPTIVE OPTICS APPLICATIONS Leonid Beresnev1, Mikhail Vorontsov1,2 and Peter Wangsness3 1) US Army Research Laboratory, 2800 Powder Mill Road, Adelphi Maryland 20783, lberesnev@arl.army.mil,

More information

Sound recording & playback

Sound recording & playback Sound recording & playback Dynamic microphone Condenser microphone Carbon microphone Frequency response curves Sound recording Amplifiers Loudspeakers Sound recording & playback - 1 Dynamic microphone

More information

Non-linear Digital Audio Processor for dedicated loudspeaker systems

Non-linear Digital Audio Processor for dedicated loudspeaker systems Non-linear Digital Audio Processor for dedicated loudspeaker systems A. Bellini, G. Cibelli, E. Ugolotti, A. Farina, C. Morandi In this paper we describe a digital processor, which operates the audio signal

More information

Liquid sensor probe using reflecting SH-SAW delay line

Liquid sensor probe using reflecting SH-SAW delay line Sensors and Actuators B 91 (2003) 298 302 Liquid sensor probe using reflecting SH-SAW delay line T. Nomura *, A. Saitoh, T. Miyazaki Faculty of Engineering, Shibaura Institute of Technology, 3-9-14 Shibaura,

More information

FS SERIES FS-8000 FS-SD9 FS-SD7 FS-SD5

FS SERIES FS-8000 FS-SD9 FS-SD7 FS-SD5 FS SERIES FS-8000 FS-SD9 FS-SD7 FS-SD5 Here are the upgraded lifestyle CD systems from JVC for 2000. They combine futuristic, individualized styling, pure hi-fi sound and fingertip ease of use in handy

More information

Acoustic Resonance Lab

Acoustic Resonance Lab Acoustic Resonance Lab 1 Introduction This activity introduces several concepts that are fundamental to understanding how sound is produced in musical instruments. We ll be measuring audio produced from

More information

New transducer technology A.R.T. = Accelerated Ribbon Technology - evolution of the air motion transformer principle

New transducer technology A.R.T. = Accelerated Ribbon Technology - evolution of the air motion transformer principle 106. AES Convention Munich 1999 Klaus Heinz Berlin New transducer technology A.R.T. = Accelerated Ribbon Technology - evolution of the air motion transformer principle Abstract The paper describes new

More information

VARIABLE INDUCTANCE TRANSDUCER

VARIABLE INDUCTANCE TRANSDUCER VARIABLE INDUCTANCE TRANSDUCER These are based on a change in the magnetic characteristic of an electrical circuit in response to a measurand which may be displacement, velocity, acceleration, etc. 1.

More information

Selecting the right directional loudspeaker with well defined acoustical coverage

Selecting the right directional loudspeaker with well defined acoustical coverage Selecting the right directional loudspeaker with well defined acoustical coverage Abstract A well defined acoustical coverage is highly desirable in open spaces that are used for collaboration learning,

More information

Speech, Hearing and Language: work in progress. Volume 12

Speech, Hearing and Language: work in progress. Volume 12 Speech, Hearing and Language: work in progress Volume 12 2 Construction of a rotary vibrator and its application in human tactile communication Abbas HAYDARI and Stuart ROSEN Department of Phonetics and

More information

Sonic Distance Sensors

Sonic Distance Sensors Sonic Distance Sensors Introduction - Sound is transmitted through the propagation of pressure in the air. - The speed of sound in the air is normally 331m/sec at 0 o C. - Two of the important characteristics

More information

For details please contact: YAMAHA CORPORATION P.O. Box 1, Hamamatsu, Japan. Visit us at our website:

For details please contact: YAMAHA CORPORATION P.O. Box 1, Hamamatsu, Japan. Visit us at our website: YAMAHA CORPORATIO P.O. Box 1, Hamamatsu, Japan "d-cinema" is the slogan of Yamaha A/V products and technology, reflecting our focus on digital technology and our leadership in creating and refining digital

More information

Acquisition and Analysis of Continuous Acoustic Emission Waveform for Classification of Damage Sources in Ceramic Fiber Mat

Acquisition and Analysis of Continuous Acoustic Emission Waveform for Classification of Damage Sources in Ceramic Fiber Mat Materials Transactions, Vol. 48, No. 6 (27) pp. 1221 to 1226 Special Issue on Advances in Non-Destructive Inspection and Materials Evaluation #27 The Japanese Society for Non-Destructive Inspection Acquisition

More information

Kistler portable triaxial Force Plate

Kistler portable triaxial Force Plate Kistler portable triaxial Force Plate 1 Transducers Transducer - any device that converts one form of energy into another Sensors convert physical quantities into electrical signals electrical signals

More information

describe sound as the transmission of energy via longitudinal pressure waves;

describe sound as the transmission of energy via longitudinal pressure waves; 1 Sound-Detailed Study Study Design 2009 2012 Unit 4 Detailed Study: Sound describe sound as the transmission of energy via longitudinal pressure waves; analyse sound using wavelength, frequency and speed

More information

Physics Spring 2006 Experiment 9 TRAVELING WAVES

Physics Spring 2006 Experiment 9 TRAVELING WAVES Physics 31210 Spring 2006 Experiment 9 TRAVELING WAVES Reference: Halliday, Resnick & Walker, 7th Ed., Sections 16-1 to 5, Sections 17-1 to 4 I. Introduction: Waves of all kinds, propagating through many

More information

Energy Circulation Methods for Surface Acoustic Wave Motor

Energy Circulation Methods for Surface Acoustic Wave Motor Electronics and Communications in Japan, Part 3, Vol. 87, No. 2, 2004 Translated from Denshi Joho Tsushin Gakkai Ronbunshi, Vol. J86-A, No. 4, April 2003, pp. 345 353 Energy Circulation Methods for Surface

More information

Precision machining and measurement of micro aspheric molds

Precision machining and measurement of micro aspheric molds Precision machining and measurement of micro aspheric molds H. Suzuki 1,3, T. Moriwaki 2,. amagata 3, and T. Higuchi 4 1 Chubu University, Kasugai, Aichi, Japan 2 Setsunan University, Neyagawa, Osaka,

More information

A Guide to Reading Transducer Specification Sheets

A Guide to Reading Transducer Specification Sheets A Guide to Reading Transducer Specification Sheets There are many numbers and figures appearing on a transducer specification sheet. This document serves as a guide to understanding the key parameters,

More information

Structure for Ultrasonic Suspension Gap Pressure Sensor

Structure for Ultrasonic Suspension Gap Pressure Sensor Sensors and Materials, Vol. 29, No. 6 (2017) 805 816 MYU Tokyo 805 S & M 1369 Structure for Ultrasonic Suspension Gap Pressure Sensor Masaya Takasaki, * Ryutaro Chida, Shota Chino, Satoshi Morishita, 1

More information

Mechatronics Chapter Sensors 9-1

Mechatronics Chapter Sensors 9-1 MEMS1049 Mechatronics Chapter Sensors 9-1 Proximity sensors and Switches Proximity sensor o o o A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact.

More information

UNIVERSITY OF UTAH ELECTRICAL ENGINEERING DEPARTMENT LABORATORY PROJECT NO. 3 DESIGN OF A MICROMOTOR DRIVER CIRCUIT

UNIVERSITY OF UTAH ELECTRICAL ENGINEERING DEPARTMENT LABORATORY PROJECT NO. 3 DESIGN OF A MICROMOTOR DRIVER CIRCUIT UNIVERSITY OF UTAH ELECTRICAL ENGINEERING DEPARTMENT EE 1000 LABORATORY PROJECT NO. 3 DESIGN OF A MICROMOTOR DRIVER CIRCUIT 1. INTRODUCTION The following quote from the IEEE Spectrum (July, 1990, p. 29)

More information

A Custom Vibration Test Fixture Using a Subwoofer

A Custom Vibration Test Fixture Using a Subwoofer Paper 068, ENT 205 A Custom Vibration Test Fixture Using a Subwoofer Dale H. Litwhiler Penn State University dale.litwhiler@psu.edu Abstract There are many engineering applications for a source of controlled

More information

The NEO8 and NEO8 PDR high performance wideband, planar-magnetic transducers

The NEO8 and NEO8 PDR high performance wideband, planar-magnetic transducers The NEO8 and NEO8 PDR high performance wideband, planar-magnetic transducers The NEO8 and Neo8 PDR are planar-magnetic (ribbon) transducers that use an innovative hightech diaphragm material called Kaladex

More information

MICROMACHINED INTERFEROMETER FOR MEMS METROLOGY

MICROMACHINED INTERFEROMETER FOR MEMS METROLOGY MICROMACHINED INTERFEROMETER FOR MEMS METROLOGY Byungki Kim, H. Ali Razavi, F. Levent Degertekin, Thomas R. Kurfess G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta,

More information

WHOLE BODY L-BAND RESONATOR WITH A WIDE RANGE FREQUENCY TUNING USING PIEZO ACTUATOR

WHOLE BODY L-BAND RESONATOR WITH A WIDE RANGE FREQUENCY TUNING USING PIEZO ACTUATOR Current Topics in Biophysics 2002, 26(1), 15-19 WHOLE BODY L-BAND RESONATOR WITH A WIDE RANGE FREQUENCY TUNING USING PIEZO ACTUATOR PAVEL CEVC 1, TADEUSZ WALCZAK 2, HAROLD M. SWARTZ 2 1 Jozef Stefan Institute,

More information

Figure 1: Layout of the AVC scanning micromirror including layer structure and comb-offset view

Figure 1: Layout of the AVC scanning micromirror including layer structure and comb-offset view Bauer, Ralf R. and Brown, Gordon G. and Lì, Lì L. and Uttamchandani, Deepak G. (2013) A novel continuously variable angular vertical combdrive with application in scanning micromirror. In: 2013 IEEE 26th

More information

Analysis of Edge Boundaries in Multiactuator Flat Panel Loudspeakers

Analysis of Edge Boundaries in Multiactuator Flat Panel Loudspeakers nd International Conference on Computer Design and Engineering (ICCDE ) IPCSIT vol. 9 () () IACSIT Press, Singapore DOI:.7763/IPCSIT..V9.8 Analysis of Edge Boundaries in Multiactuator Flat Panel Loudspeakers

More information

1.6 Beam Wander vs. Image Jitter

1.6 Beam Wander vs. Image Jitter 8 Chapter 1 1.6 Beam Wander vs. Image Jitter It is common at this point to look at beam wander and image jitter and ask what differentiates them. Consider a cooperative optical communication system that

More information

PIV STUDY OF STANDING WAVES IN A RESONANT AIR COLUMN

PIV STUDY OF STANDING WAVES IN A RESONANT AIR COLUMN PIV STUDY OF STANDING WAVES IN A RESONANT AIR COLUMN Pacs: 43.58.Fm, 43.20.Ye, 43.20.Ks Tonddast-Navaei, Ali; Sharp, David Open University Department of Environmental and Mechanical Engineering, Open University,

More information

Synchronization Control Scheme for Hybrid Linear Actuator Based on One Common Position Sensor with Long Travel Range and Nanometer Resolution

Synchronization Control Scheme for Hybrid Linear Actuator Based on One Common Position Sensor with Long Travel Range and Nanometer Resolution Sensors & Transducers 2014 by IFSA Publishing, S. L. http://www.sensorsportal.com Synchronization Control Scheme for Hybrid Linear Actuator Based on One Common Position Sensor with Long Travel Range and

More information

Development of a Vibration Measurement Method for Cryocoolers

Development of a Vibration Measurement Method for Cryocoolers REVTEX 3.1 Released September 2 Development of a Vibration Measurement Method for Cryocoolers Takayuki Tomaru, Toshikazu Suzuki, Tomiyoshi Haruyama, Takakazu Shintomi, Akira Yamamoto High Energy Accelerator

More information

Time-domain simulation of the bowed cello string: Dual-polarization effect

Time-domain simulation of the bowed cello string: Dual-polarization effect Time-domain simulation of the bowed cello string: Dual-polarization effect Hossein Mansour, Jim Woodhouse, and Gary Scavone Citation: Proc. Mtgs. Acoust. 19, 035014 (2013); View online: https://doi.org/10.1121/1.4800058

More information

Applications of Physics 12 June 2002 Provincial Examination

Applications of Physics 12 June 2002 Provincial Examination Applications of Physics 12 June 2002 Provincial Examination ANSWER KEY / SCORING GUIDE CURRICULUM: Organizers Sub-Organizers 1. Transformers A, B, C 2. Momentum D, E 3. Energy Conversion F 4. Transducers

More information

Actuators in Automatic Control System

Actuators in Automatic Control System Actuators in Automatic Control System Measurement & Control Systems Transducers Measurement Process Actuators Data processing Requirement analyses Decision making Control actions CONTROL action requires

More information

Fig 1 Microphone transducer types

Fig 1 Microphone transducer types Microphones Microphones are the most critical element in the recording chain. Every sound not created purely electronically must be transduced through a microphone in order to be recorded. There is a bewildering

More information

Actuators, sensors and control architecture

Actuators, sensors and control architecture Actuators, sensors and control architecture a robot is composed of three fundamental parts actuators besides motors and transmissions, they constitute the locomotion apparatus (wheels, crawlers, mechanical

More information

Biomimetic Design of Actuators, Sensors and Robots

Biomimetic Design of Actuators, Sensors and Robots Biomimetic Design of Actuators, Sensors and Robots Takashi Maeno, COE Member of autonomous-cooperative robotics group Department of Mechanical Engineering Keio University Abstract Biological life has greatly

More information

Piezoelectric Fiber Composite Ultrasonic Transducers for Guided Wave Structural Health Monitoring

Piezoelectric Fiber Composite Ultrasonic Transducers for Guided Wave Structural Health Monitoring More Info at Open Access Database www.ndt.net/?id=15125 Piezoelectric Fiber Composite Ultrasonic Transducers for Guided Wave Structural Health Monitoring Ching-Chung Yin a, Jing-Shi Chen b, Yu-Shyan Liu

More information

Investigating the Electromechanical Coupling in Piezoelectric Actuator Drive Motor Under Heavy Load

Investigating the Electromechanical Coupling in Piezoelectric Actuator Drive Motor Under Heavy Load Investigating the Electromechanical Coupling in Piezoelectric Actuator Drive Motor Under Heavy Load Tiberiu-Gabriel Zsurzsan, Michael A.E. Andersen, Zhe Zhang, Nils A. Andersen DTU Electrical Engineering

More information

Active Vibration Isolation of an Unbalanced Machine Tool Spindle

Active Vibration Isolation of an Unbalanced Machine Tool Spindle Active Vibration Isolation of an Unbalanced Machine Tool Spindle David. J. Hopkins, Paul Geraghty Lawrence Livermore National Laboratory 7000 East Ave, MS/L-792, Livermore, CA. 94550 Abstract Proper configurations

More information

A. K. Sawhney - A course in Electrical and electronics measurement and Instrumentation, Dhanpatrai & Sons

A. K. Sawhney - A course in Electrical and electronics measurement and Instrumentation, Dhanpatrai & Sons Ruchi Gajjar A. K. Sawhney - A course in Electrical and electronics measurement and Instrumentation, Dhanpatrai & Sons It is necessary to have a permanent record or state of a phenomenon being investigated

More information

XYZ Stage. Surface Profile Image. Generator. Servo System. Driving Signal. Scanning Data. Contact Signal. Probe. Workpiece.

XYZ Stage. Surface Profile Image. Generator. Servo System. Driving Signal. Scanning Data. Contact Signal. Probe. Workpiece. Jpn. J. Appl. Phys. Vol. 40 (2001) pp. 3646 3651 Part 1, No. 5B, May 2001 c 2001 The Japan Society of Applied Physics Estimation of Resolution and Contact Force of a Longitudinally Vibrating Touch Probe

More information

Proceedings of Meetings on Acoustics

Proceedings of Meetings on Acoustics Proceedings of Meetings on Acoustics Volume 19, 2013 http://acousticalsociety.org/ ICA 2013 Montreal Montreal, Canada 2-7 June 2013 Signal Processing in Acoustics Session 1pSPc: Miscellaneous Topics in

More information

Advanced Machining Processes Professor Vijay K. Jain Department of Mechanical Engineering Indian Institute of Technology, Kanpur Lecture 06

Advanced Machining Processes Professor Vijay K. Jain Department of Mechanical Engineering Indian Institute of Technology, Kanpur Lecture 06 Advanced Machining Processes Professor Vijay K. Jain Department of Mechanical Engineering Indian Institute of Technology, Kanpur Lecture 06 (Refer Slide Time: 00:17) Today we are going to discuss about

More information

the pilot valve effect of

the pilot valve effect of Actiive Feedback Control and Shunt Damping Example 3.2: A servomechanism incorporating a hydraulic relay with displacement feedback throughh a dashpot and spring assembly is shown below. [Control System

More information

Investigating the Electromechanical Coupling in Piezoelectric Actuator Drive Motor Under Heavy Load

Investigating the Electromechanical Coupling in Piezoelectric Actuator Drive Motor Under Heavy Load Downloaded from orbit.dtu.dk on: Nov 21, 2018 Investigating the Electromechanical Coupling in Piezoelectric Actuator Drive Motor Under Heavy Load Zsurzsan, Tiberiu-Gabriel; Andersen, Michael A. E.; Zhang,

More information

Module 4 General Purpose Machine Tools. Version 2 ME, IIT Kharagpur

Module 4 General Purpose Machine Tools. Version 2 ME, IIT Kharagpur Module 4 General urpose Machine Tools Lesson 24 Forces developing and acting in machine tools Instructional objectives At the end of this lesson, the students will be able to; (i) Identify the sources

More information

Resonance Tube. 1 Purpose. 2 Theory. 2.1 Air As A Spring. 2.2 Traveling Sound Waves in Air

Resonance Tube. 1 Purpose. 2 Theory. 2.1 Air As A Spring. 2.2 Traveling Sound Waves in Air Resonance Tube Equipment Capstone, complete resonance tube (tube, piston assembly, speaker stand, piston stand, mike with adaptors, channel), voltage sensor, 1.5 m leads (2), (room) thermometer, flat rubber

More information

MEMS for RF, Micro Optics and Scanning Probe Nanotechnology Applications

MEMS for RF, Micro Optics and Scanning Probe Nanotechnology Applications MEMS for RF, Micro Optics and Scanning Probe Nanotechnology Applications Part I: RF Applications Introductions and Motivations What are RF MEMS? Example Devices RFIC RFIC consists of Active components

More information