Multicomponent directional laser Doppler velocimeter based on heterodyning by means of Nd:YAG laser frequency modulation and short fiber delay lengths

Juergen W. Czarske; O. Doelle; Ingo Freitag; Herbert Welling; Harald Mueller

doi:10.1117/12.281254

24 September 1997 Multicomponent directional laser Doppler velocimeter based on heterodyning by means of Nd:YAG laser frequency modulation and short fiber delay lengths

Juergen W. Czarske, O. Doelle, Ingo Freitag, Herbert Welling, Harald Mueller

Author Affiliations +

Proceedings Volume 3099, Micro-optical Technologies for Measurement, Sensors, and Microsystems II and Optical Fiber Sensor Technologies and Applications; (1997) https://doi.org/10.1117/12.281254
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

A novel method for the directional multicomponent laser Doppler velocimetry, LDV, based on the generation of different carrier frequencies, one for each velocity component, is presented. The carrier frequencies are generated by a chirp laser frequency modulation in conjunction with fiber delay lines of different lengths. Since the carrier frequency generation is realized without involving additional frequency shift elements like Bragg cells the LDV arrangement can be significantly simplified. Accurate velocity measurements without influence of carrier frequency fluctuations are accomplished by correlating the generated measuring Doppler signal with reference signals, given by the same carrier frequencies. The employed quadrature demodulation signal processing technique enables the measurement of the momentary Doppler frequency in the baseband. This novel LDV system is demonstrated by a directional measurement of two orthogonal velocity components of fluid flows.

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Juergen W. Czarske, O. Doelle, Ingo Freitag, Herbert Welling, and Harald Mueller "Multicomponent directional laser Doppler velocimeter based on heterodyning by means of Nd:YAG laser frequency modulation and short fiber delay lengths", Proc. SPIE 3099, Micro-optical Technologies for Measurement, Sensors, and Microsystems II and Optical Fiber Sensor Technologies and Applications, (24 September 1997); https://doi.org/10.1117/12.281254

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KEYWORDS

Laser Doppler velocimetry

Modulation

Heterodyning

Doppler effect

Frequency modulation

Nd:YAG lasers

Bragg cells

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