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Proceedings Paper

Effect of target position on signal amplitude in laser Doppler vibrometer
Author(s): Vyacheslav Aranchuk
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Paper Abstract

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.

Paper Details

Date Published: 11 November 1999
PDF: 8 pages
Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); doi: 10.1117/12.369377
Show Author Affiliations
Vyacheslav Aranchuk, Scientific Ctr. for Machine Mechanics Problems (United States)

Published in SPIE Proceedings Vol. 3897:
Advanced Photonic Sensors and Applications
Robert A. Lieberman; Anand Krishna Asundi; Hiroshi Asanuma, Editor(s)

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