Share Email Print
cover

Proceedings Paper

Multicomponent directional laser Doppler velocimeter based on heterodyning by means of Nd:YAG laser frequency modulation and short fiber delay lengths
Author(s): Juergen W. Czarske; O. Doelle; Ingo Freitag; Herbert Welling; Harald Mueller
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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.

Paper Details

Date Published: 24 September 1997
PDF: 11 pages
Proc. SPIE 3099, Micro-optical Technologies for Measurement, Sensors, and Microsystems II and Optical Fiber Sensor Technologies and Applications, (24 September 1997); doi: 10.1117/12.281254
Show Author Affiliations
Juergen W. Czarske, Laser Zentrum Hannover e.V. (Germany)
O. Doelle, Laser Zentrum Hannover e.V. (Germany)
Ingo Freitag, Laser Zentrum Hannover e.V. (Germany)
Herbert Welling, Laser Zentrum Hannover e.V. (Germany)
Harald Mueller, Physikalisch-Technische Bundesanstalt (Germany)


Published in SPIE Proceedings Vol. 3099:
Micro-optical Technologies for Measurement, Sensors, and Microsystems II and Optical Fiber Sensor Technologies and Applications

© SPIE. Terms of Use
Back to Top