Accuracy of zero crossing counting in laser Doppler velocimetry

Ivan Popov

doi:10.1117/12.468161

22 May 2002 Accuracy of zero crossing counting in laser Doppler velocimetry

Ivan Popov

Proceedings Volume 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2002) https://doi.org/10.1117/12.468161
Event: Fifth International Conference on Vibration Measurements by Laser Techniques, 2002, Ancona, Italy

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.

Citation Download Citation

Ivan Popov "Accuracy of zero crossing counting in laser Doppler velocimetry", Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); https://doi.org/10.1117/12.468161

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