Quadrature demodulation: a new LDV burst-signal frequency estimator

Juergen W. Czarske; Fromund Hock; Harald Mueller

doi:10.1117/12.150568

6 August 1993 Quadrature demodulation: a new LDV burst-signal frequency estimator

Juergen W. Czarske, Fromund Hock, Harald Mueller

Proceedings Volume 2052, Fifth International Conference on Laser Anemometry: Advances and Applications; (1993) https://doi.org/10.1117/12.150568
Event: Laser Anemometry: Advances and Applications: Fifth International Conference, 1993, Koningshof, Veldhoven, Netherlands

Abstract

A novel frequency estimation method for the evaluation of LDA burst signals is presented. The new method is based on the measurement of time series of phase angles defined by a pair of quadrature signals (sine/cosine signal pair). Up to now quadrature techniques have preponderantly been used in the two beam interferometry for carrying out direction sensitive and high resolution measurements as well as in radio frequency applications. The quadrature demodulation technique can be considered as a straightforward development of the counter technique with the advantages of a higher resolution for a single burst evaluation and of directional discrimination. Compared with conventional signal processing techniques the application of the quadrature demodulation technique additionally allows a directional discrimination and the analysis of velocity fluctuations within single Doppler signal bursts with a higher accuracy by evaluating the measured time series of phase angle values.

Citation Download Citation

Juergen W. Czarske, Fromund Hock, and Harald Mueller "Quadrature demodulation: a new LDV burst-signal frequency estimator", Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); https://doi.org/10.1117/12.150568

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