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11 November 1999 Effect of target position on signal amplitude in laser Doppler vibrometer
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Proceedings Volume 3897, Advanced Photonic Sensors and Applications; (1999)
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore
Laser Doppler vibrometers are widely used to obtain velocity information from vibrating targets. Doppler shift of the light scattered from a vibrating target is detected by using heterodyning with a reference beam. To obtain high spatial resolution and high intensity of the backscattered light and to produce speckles of large size at a photodetector plane the target is placed in the waist of a probe laser beam. At that target position the curvatures of the wavefronts of the reference beam and the scattered light can be different. The difference in the wavefront curvatures result in mismatching of wavefronts of the heterodyning beams and decreasing in the Doppler signal amplitude.
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Vyacheslav Aranchuk "Effect of target position on signal amplitude in laser Doppler vibrometer", Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999);

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