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Proceedings Paper

Direction sensitive laser Doppler velocimeter using the optical frequency shift of two stabilized laser diodes
Author(s): Harald Mueller; Dietrich Dopheide
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Paper Abstract

The commonly used techniques for directional discrimination in velocity measurements involve a frequency shift of the LDA light beams which are focussed into the measuring volume. The paper presents a new technique for the generation of a frequency shift be using the optical frequency difference of two current and temperature stabilized monomode laser diodes. By focussing the output beams of the two frequency stabilized laser diodes into the measuring volume it is possible (1) to save the commonly required components for the beam splitting and frequency shifting and (2) to double the light intensity in the measuring volume. It will be shown that using conventional laser diodes, the influence of frequency shift fluctuations and large band widths on the measuring information in the carrier frequency signal can be eliminated by appropriate heterodyne signal processing techniques. The concept of the described new frequency shift technique will be discussed critically and first experimental results will be presented.

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: 10.1117/12.150520
Show Author Affiliations
Harald Mueller, Physikalisch-Technische Bundesanstalt (Germany)
Dietrich Dopheide, Physikalisch-Technische Bundesanstalt (Germany)


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

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