Taking laser Doppler vibrometry off the tripod
- Publication Type:
- Conference Proceeding
- 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling, 2018, 1 pp. 136 - 143
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© 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. All rights reserved. Laser Doppler vibrometers are now well-established as an effective non-contact alternative to traditional contacting transducers. Despite over 30 years of successful applications, however, very little attention has been given to sensitivity to vibration of the instrument itself. In this paper, sensitivity to instrument vibration and steering optics vibration is confirmed before development theoretically and experimentally of practical schemes to enable correction of measurements. In the case of instrument vibration, the correction scheme requires a pair of sensors with appropriate orientation and relative location. In the case of a beam steering mirror vibration, the correction scheme requires a single measurement from an appropriate location on the back-surface of the mirror in line with the laser beam incidence point. In both cases, frequency domain processing conveniently accommodates inter-channel time delay and signal integrations. Error reductions in excess of 30 dB are delivered in laboratory tests with simultaneous instrument / steering optic and target vibration over a broad frequency range. The practical nature of the correction techniques is demonstrated by successful applications of each. Finally, a previously unreported challenging real-world measurement scenario is described.
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