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Proceedings Paper

Accuracy of zero crossing counting in laser Doppler velocimetry
Author(s): Ivan Popov
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Paper Abstract

The statistical properties ofphotodetector current in laser Doppler velocimeter are studied. The analysis of zero crossing counting shows that it overestimates by certain amount velocity and displacement measurements. The dispersion of zero counts in the presence of additive shot noise is also studied. The simple analytical expression for dispersion of zero counts is obtained in absence of additive shot noise. It shows that the relative accuracy of velocity or displacement measurement is inversely proportional to the square root ofmeasured distance. The relative dispersion ofzero counts less than 0.005 % can be achieved while measuring 5 mdisplacement if certain requirements concerning signal-to-noise ratio are met.

Paper Details

Date Published: 22 May 2002
PDF: 9 pages
Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); doi: 10.1117/12.468161
Show Author Affiliations
Ivan Popov, George Kelk Corp. (Canada)


Published in SPIE Proceedings Vol. 4827:
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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