Roland Kruse, Tiedo Meyer: Vibration platform for the calibration of optical sensors
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1 Roland Kruse, Tiedo Meyer: Vibration platform for the calibration of optical sensors
2 Overview The project KOLOS Vibration sensor Measurement principle Vibration platform I Concept Characteristics / Performance Vibration platform II Characteristics / Performance Summary
3 The project KOLOS (Cost-Effective Laser Sensor for Optical Vibration Measurements) Low cost, contactless sensor for measuring the amplitude of in-plane vibrations Based on the evaluation of the speckle pattern of the surface Alternative to laser vibrometers (large, expensive but contactless) and accelerometers (low cost, triaxial measurement, high precision but has to be bond to surface) Device required for Calibration of the new sensor Check it s performance (amplitude and frequency range) Check the effect of surface - normal vibrations (Can the sensor surely distinguish vibrations in different directions?) Needed: Device for reproduction of vibrations in 3D
4 The vibration sensor I Laserstrahl Laser beam h(x) Path length difference interferierende Wellen Interfering waves Phasendifferenz Beobachtungs- Schirm Screen / (CCD) resultierendes Speckle pattern Specklemuster sphärische Wellenfronten raue Rough Oberfläche surface
5 The vibration sensor II Typ A Typ B Typ C Laser Specklebewegung Specles move nach right rechts Laser No Keine specle Specklebewegung movement Laser Specklebewegung Specles move nach links right CCD CCD CCD Probenbewegung Probenbewegung Probenbewegung Sample movement Sample movement Sample movement
6 The vibration sensor III No motion With linear motion
7 The vibration sensor IV Arbitary measure of correlation f = 50 Hz f = 100 Hz f = 130 Hz f = 200 Hz Vibration amplitude [µm]
8 The vibration sensor V Diode laser Lens Camera
9 Vibration platform: Concept Aluminium plate ( 5 * 5 cm²) driven by electro-dynamical shakers Elastic suspension 3D accelerometer for vibration monitoring PC (Matlab) providing GUI and vibration control, including crosstalk compensation Amplitude limited by nominal shaker force, frequency by first eigenmode of plate Requirement: 10 µm amplitude up to 500 Hz (~ 10 g)
10 Vibration platform I: Model Teflon insert Aluminium plate, 10 * 10 cm², edge polished Rubber damper Shaker, 9N Accelerometer
11 Vibration platform I: Photo For adjusting contact force shaker / plate
12 Vibration Platform I: Characteristics Frequency response Amplitude range Crosstalk Motion pattern
13 Vibration platform I: Frequency response Non - linearity: Dependence of frequency response on driving voltage 45 Sensitivity [ µm/v ] Mount softening with increase deflection Frequency [Hz]
14 Vibration platform I: Amplitude range X - direction: Amplitude range for THD+N < 1% F Shaker < F Mass + F Spring F Shaker, Max = F spring deformation + F mass acceleration Mass and spring system Displacement [ µm ] 10 1 Performance unexpectedly poor Frequency [Hz]
15 Vibration platform I: Crosstalk compensation Before compensation 30 Displacement [ µm ] After compensation, inversely phased signal output Displacement [ µm ]
16 Vibration platform I: Crosstalk compensation Crosstalk for 10 µm vibration in X - direction x y Y Z Y comp Z comp Crosstalk [%] 8 6 No compensation x z 4 2 With compensation Frequency [Hz]
17 Vibration platform I: Motion pattern Velocity vectors Z Y X
18 Vibration platform I: Motion pattern (Z) Position vs. time Z Free edge Shaker contact Y Shaker contact X
19 Vibration platform I: Summary Design generally adequate Crosstalk cancellation working Non linear behavior means control system required (Proportional controller) Vibration amplitude above 300 Hz too low Z vibration not uniform on the surface Reduce mass of vibrating parts Make design more symmetric
20 Vibration platform II: Photo
21 Vibration Platform II: Characteristics Amplitude range Crosstalk Uniformity of vibration
22 Vibration platform II: Amplitude range X X - direction: Amplitude range for THD+N < 1% Y removed Deflection [µm] Transition stick -> slip? 10-1 a ~ 0.14 m/s² Frequency [Hz]
23 Vibration platform: Model Teflon insert Aluminium plate, 10 * 10 cm², edge polished Rubber damper Shaker, 9N Accelerometer
24 Vibration platform II: Amplitude range Z Z - direction: Amplitude range for THD+N < 1% Deflection [µm] a ~ 0.59 m/s² Higher stiffness of suspension compared to X, Y Frequency [Hz]
25 Vibration platform II: Crosstalk Crosstalk for 10 µm vibration in X - direction 7 Crosstalk [%] No compensation x -> y x -> z 2 1 With compensation Frequency [Hz]
26 Vibration platform II: Z - vibration Difference in vibration amplitude between two positions (edges) on the surface 3 2 Level difference [db] Difference in stiffness of rubber mounts Frequency [Hz]
27 Summary Platform for reproduction of 3D vibrations has been constructed Useful for testing and calibration of (optical) vibration sensors if 1D calibration is not sufficient Frequency range of Hz with an amplitude 10 µm (maximum 200 µm) Simple and effective crosstalk compensation Reasonable uniform vibration amplitude on the surface
28 Thank you for your attention!
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