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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1990),
  • paper CFS4

Rapid velocity measurement using two-beam coupling

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Abstract

Currently available nonperturbative flow velocity measurement techniques include such methods as laser Doppler velocimetry, fluorescence line shape detection,1 flow-marking methods,2 and schlieren. These techniques yield flow velocities in a wide range of environments. Below we describe a two-beam coupling induced- grating technique that we have demonstrated in a flowing liquid cell. Other grating techniques have been demonstrated,3,4 but they do not use the simple two-beam arrangement. Our method has a number of useful properties: (1) it allows rapid velocity measurement with minimal postprocessing; (2) it can operate in an unseeded absorbing environment or with an atomic or molecular seed; (3) it is self-normalizing; that is, two measurements are made and their ratio is taken, so that troublesome quantities, such as beam misalignment, cancel out of the result; (4) it also yields the sign of the relevant velocity component; (5) it can be performed with a single cw laser and simple apparatus; (6) it appears to operate best at subsonic velocities and may be scalable to higher velocities; and (7) it can be performed with several beams to yield all three components (including signs) of the velocity simultaneously.

© 1990 Optical Society of America

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