Multiple-component laser Doppler velocimeter using a chirp-frequency-modulated Nd:YAG ring laser and fiber delay lines

Juergen W. Czarske; O. Doelle; Ingo Freitag; Carsten Fallnich

doi:10.1117/12.354809

19 July 1999 Multiple-component laser Doppler velocimeter using a chirp-frequency-modulated Nd:YAG ring laser and fiber delay lines

Juergen W. Czarske, O. Doelle, Ingo Freitag, Carsten Fallnich

Author Affiliations +

Proceedings Volume 3749, 18th Congress of the International Commission for Optics; (1999) https://doi.org/10.1117/12.354809
Event: ICO XVIII 18th Congress of the International Commission for Optics, 1999, San Francisco, CA, United States

Abstract

A 2D directional laser Doppler velocimeter (LDV), which is based on the generation of heterodyne signals of different carrier frequencies, so that different velocity components can be detected simultaneously will be presented. The carrier frequencies are generated by a chirp frequency modulation of a diode-pumped monolithic Nd:YAG miniature ring laser in combination with fiber delay lines of a few 100 m lengths. Since this heterodyne technique is based on a complete spliced fiber optic unit without additional frequency shift elements, a simple alignment-insensitive heterodyne LDV system can be realized. Together with the Nd:YAG laser, emitting about 1 W single-frequency power, a portable powerful LDV was realized. The generated LDV signals are evaluated by the quadrature demodulation signal processing technique, which allows the measurement of the Doppler frequency with a high time resolution. As a result, frequency modulated LDV signals, e.g. from sound waves or turbulent flows, can be evaluated.

Citation Download Citation

Juergen W. Czarske, O. Doelle, Ingo Freitag, and Carsten Fallnich "Multiple-component laser Doppler velocimeter using a chirp-frequency-modulated Nd:YAG ring laser and fiber delay lines", Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.354809

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