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Quadrature demodulation technique used in laser Doppler velocimetry

Quadrature demodulation technique used in laser Doppler velocimetry

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The authors present a technique for applying quadrature demodulation to determine the frequency of Doppler signals. This technique enables low-frequency signals with less than one signal period to be measured. The dependence of measurement error on signal-to-noise-ratio and measurement time is also investigated.


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      • Boashash, B., O'Shea, P., Arnold, M.: `Algorithms for instantaneous frequency estimation: acomparative study', Proc. Advanced signal processing algorithms, architectures andimplementations, SPIE, 1990, 1348, p. 126–148.

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