Investigations on the frequency measuring error of laser Doppler velocimeters using the quadrature demodulation technique

Juergen W. Czarske; O. Doelle

doi:10.1117/12.354907

19 July 1999 Investigations on the frequency measuring error of laser Doppler velocimeters using the quadrature demodulation technique

Juergen W. Czarske, O. Doelle

Author Affiliations +

Proceedings Volume 3749, 18th Congress of the International Commission for Optics; (1999) https://doi.org/10.1117/12.354907
Event: ICO XVIII 18th Congress of the International Commission for Optics, 1999, San Francisco, CA, United States

Abstract

We present the application of the quadrature demodulation technique (QDT) for time-resolved frequency measurements in laser Doppler velocimetry (LDV). In contrast to conventional frequency estimators like FFT, the QDT allows the determination of the Doppler frequency nearly independent of the number of the occurring signal periods, so that a high time resolution can be achieved. The resulting frequency error of the QDT is investigated in dependence on relevant LDV signal parameters like SNR and time duration. Furthermore, the optimum averaging time for the processing of gaussian burst signals was determined. The minimum frequency uncertainty of the QDT occurs for an averaging time of the approximately equals 1/e burst duration at the thermal noise, and the approximately equals 1/e² burst duration at shot noise, respectively.

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Juergen W. Czarske and O. Doelle "Investigations on the frequency measuring error of laser Doppler velocimeters using the quadrature demodulation technique", Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.354907

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