15-2 Nan-ei-cho, Tottori-shi JAPAN TEL FAX URL

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1 Air Transmission Ultrasonic Sensor 152 Naneicho, Tottorishi JAPAN TEL FAX URL Features Air transmission ultrasonic sensors using piezo ceramic elements transmit or receive ultrasonic sound in air. They have wide application in measurement and communications. Nippon Ceramic can offer a wide range of standard products or can provide optimal solutions to your specific requirements. Type OPEN APERTURE TYPE High sound pressure, high sensitivity sensor with unimorph and radial cone construction. Open aperture is especially for air medium application. Low reverberation type is also available for pulsed driving. Standard housing size : Φ10, Φ12, Φ16[mm] Standard frequency : 25, 32, 40[kHz] CLOSED APERTURE TYPE Water drip proof, dust proof outdoor model. All the components are enclosed in metal housing. Metal surface treatment is available for severe ambient condition. Standard housing size : Φ14, Φ15, Φ18[mm] Standard frequency : 40~60[kHz] Application No. Application Method 1 Car alarm system Doppler 2 Lighting control 3 Parking aid sensor Pulse burst 4 Automatic door control 5 Liquid level measurement 6 Distance measurement 7 Traffic signal control 8 Robot 1 / 6

2 Principle of operation When driven from an alternating voltage source of suitable frequency, the polarized piezoelectric element mechanically distorts in proportion to the applied voltage generating a sound field. Conversely an element subjected to such a sound field will generate a voltage proportional to its intensity. The effect can be enhanced by gluing the element to a metal diaphragm, which is known as unimorph structure. When signal voltage is applied to this unimorph vibrator it creates a bending vibration. When the signal frequency meets the mechanical resonance frequency the vibrator transmits ultrasound most efficiently. This operation is used as a transmitter. When incoming ultrasound vibrates the vibrator at resonance frequency the mechanical bending vibration efficiently generates electric voltage between the vibrator electrodes. This operation is used as a receiver. Open Aperture Type ultrasonic wave piezo ceramic element ultrasonic wave Closed Aperture Type metal diaphram input voltage output voltage piezo ceramic housing radial cone metal diaphram piezo ceramic element lead wire lead terminal vibration surface piezo ceramic element housing damper lead wire damper housing silicone potting wire lead terminal connector Model code description ( example ) P T : P : Closed Aperture 2: T : Transmitter R : Receiver C : Common 3: Center frequency[khz] 4: Housing diameter[ mm ] 2 / 6

3 Specifications Open Aperture Type 1:Reflected sensitivity 2:All products Maximum input voltage 20Vrms (10Vrms is exceptionally applied to the 10mm diameter products) 3 :3 colors are available; Black, Beige, Gray AppearanceⅠ A B C D Designs and specifications are subject to change without notice. 3 / 6

4 Closed Aperture Type AppearanceⅡ E F φ18.0 φ φ G Designs and specifications are subject to change without notice. 4 / 6

5 Test circuit Frequency characteristic Transmitter(SPL) :0dB=0.0002μbar test object standard microphone OSC AMP REC COUNT 300mm frequency synchronizing Frequency characteristic Receiver(sensitivity) :0dB=1V/μbar OSC 94dB constant sound field feedback standard microphone test object tweeter AMP AMP REC COUNT 300mm frequency synchronizing Reflected sensitivity( model:c4016a1 ) (Standard level 0dB = Appended voltage 20Vpp) 1K reflector ultrasonic sensor distance 300mm reflector size W:100mm H:100mm T: 1mm Reflected sensitivity( Flat type) 9V 1K OSC (40kHz) 33K 330μ 2SC982 Lx 22K TP.1 reflector 30cm aluminum plate W:200mm H:200mm T: 10mm synchroscope 1S / 6

6 Reference circuit 1. Crystaloscillating circuit 2. C&Roscillating circuit 10M Crystal 330K 22PF 22PF 1000P 3. Receiver circuit 4. Voltage multiplier circuit 100K 1000P ICμPC4570 VCC 1000P 1SS106 IC4011 OUT 1SS P 22μF Transformer 5. Pulse transmitter circuit VCC 3.3M 0.01μF NE IC μF Transmitter/ receiver circuit Precaution to be taken in use VCC 1. Locate sensor paying attention to the direction of radiation. 3.3M NE OUT 1SS P 1000P 1SS106 IC K 1000P ICμPC P 1S Do not apply DC voltage to avoid insulation resistance deterioration. 3. Sensor is designed for air transmission, not water. 4. Hold the sensor housing with soft material like sponger rubber to avoid noise upon impact. 6 / 6