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Proceedings Paper

Quadrature demodulation: a new LDV burst-signal frequency estimator
Author(s): Juergen W. Czarske; Fromund Hock; Harald Mueller
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Paper 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.

Paper Details

Date Published: 6 August 1993
PDF: 8 pages
Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); doi: 10.1117/12.150568
Show Author Affiliations
Juergen W. Czarske, Univ. of Hannover (Germany)
Fromund Hock, Univ. of Hannover (Germany)
Harald Mueller, Physikalisch-Technische Bundesanstalt (Germany)


Published in SPIE Proceedings Vol. 2052:
Fifth International Conference on Laser Anemometry: Advances and Applications

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