Time-division-multiplexed laser Doppler anemometry using pulsed laser diodes and optical fibers

Robert A. Lockey; Ralph P. Tatam

doi:10.1117/12.221545

29 September 1995 Time-division-multiplexed laser Doppler anemometry using pulsed laser diodes and optical fibers

Robert A. Lockey, Ralph P. Tatam

Proceedings Volume 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow; (1995) https://doi.org/10.1117/12.221545
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

A time division multiplexed laser Doppler anemometer is reported, using a single high frequency pulsed laser diode as a source. Time division multiplexing requires a single detector channel, removing the need for multiple detectors and wavelength separation optics found in conventional CW laser Doppler systems. By incorporating optical fibers into the system to distribute the pulses into each channel and impose a delay between channels, the electronic requirements of such an instrument are reduced. Results for a 2D system are presented, measured on a water-seeded air jet. Individual velocity components of up to 16 ms^-1 and overall velocities of up to 20 ^-1 have been detected, but the potential range of the instrument is very much greater.

Citation Download Citation

Robert A. Lockey and Ralph P. Tatam "Time-division-multiplexed laser Doppler anemometry using pulsed laser diodes and optical fibers", Proc. SPIE 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow, (29 September 1995); https://doi.org/10.1117/12.221545

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