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Proceedings Paper

Impact of vibration on performance of Doppler velocimeter
Author(s): Ivan Popov
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Paper Abstract

The changes in the spectrum of photocurrent in two-beam Doppler velocimeter caused by different types of vibration are analyzed. It is shown that, under certain conditions, periodical laser beam scan and surface vibration are producing identical changes in the spectrum of photocurrent. The changes might be quite considerable even with relatively small amplitude of laser beam scan of several arc seconds while monitoring slowly moving surface. The vibrational structure of Doppler and "pedestal" component in photocurrent are studied; it is shown that with vibrational velocity exceeding half of translational velocity the vibrational bands correspondent to "pedestal" and Doppler component are overlapping. The use of short acquisition time, which allows avoiding formation of broadband line structure in the spectrum, is also studied. The impact of bending vibration of translationally moving surface is also considered; due to averaging action of detector receiving aperture the impact of bending vibration is much less pronounced than that of laser beam scan or surface vibration.

Paper Details

Date Published: 21 June 2006
PDF: 10 pages
Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 63451H (21 June 2006); doi: 10.1117/12.693083
Show Author Affiliations
Ivan Popov, George Kelk Corp. (Canada)


Published in SPIE Proceedings Vol. 6345:
Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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