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Intracavity Rayleigh–Mie scattering for multipoint, two-component velocity measurement

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Abstract

A simultaneous multipoint, two-component Doppler velocimeter is described. The system uses two optical cavities: a Fabry–Perot etalon and an optical cavity for collecting and recirculating the Rayleigh–Mie-scattered light that is collected from the measurement volume in two parallel but opposite directions. Single-pulse measurements of two orthogonal components of the velocity vector in a supersonic free jet were performed to demonstrate the technique. The recirculation of the light rejected by the interferometer input mirror also increased the signal intensity by a factor of 3.5.

© 2006 Optical Society of America

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