Multiple-Line Laser Doppler Velocimetry

J. Veaux; P. Mercier; G. Behar; C. Cavailler

doi:10.1117/12.962422

17 January 1990 Multiple-Line Laser Doppler Velocimetry

J. Veaux, P. Mercier, G. Behar, C. Cavailler

Proceedings Volume 1155, Ultrahigh Speed and High Speed Photography, Photonics, and Videography '89: Seventh in a Series; (1990) https://doi.org/10.1117/12.962422
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

Laser Doppler velocimetry has became a precision tool for obtaining velocity-vs-time profiles of the motion of shocked specimens . Up to now this technique requires the use of CW-single mode Argon laser . This type of laser gives the best trade off between the necessity to have a spectral width smaller than the interferometer's free spectral range and the one to have convenient high power ( SW in the visible range ) .However it barely enables us to anlyse over a wide range of the behavior of diffusely reflecting surfaces . Furthermore this laser is cumbersome ( heavy , cooling system required ...etc ) and hardly removable . This paper presents a new conception of laser Doppler interferometry . It based on the matched filter principle using a pulsed broad bandwidth dye laser ( power > 'I kW , FWHM : 20 (,s ) coupled to a Fabry-perot interferometer acting as a spectral modulator and demodulator . In this context without any kind of laser amplifier we can record over along period of time the Doppler frequency shift of diffusely reflecting surfaces . Also we are working out the design of a multichannel interferometer. Furthermore mode stability no longer depends on emission reliability of a single mode laser but on the Fabry-Perot interferometer mechanical characteristics . Finally the system is cheap , requires no cooling system and can be easily duplicated.

Citation Download Citation

J. Veaux, P. Mercier, G. Behar, and C. Cavailler "Multiple-Line Laser Doppler Velocimetry", Proc. SPIE 1155, Ultrahigh Speed and High Speed Photography, Photonics, and Videography '89: Seventh in a Series, (17 January 1990); https://doi.org/10.1117/12.962422

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KEYWORDS

Optical fibers

Doppler effect

Dye lasers

Laser Doppler velocimetry

High speed photography

Interferometers

Photography

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