Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1981-12-08
1985-03-26
Buczinski, S. C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356318, G01P 336, G01J 330
Patent
active
045069794
ABSTRACT:
A uniquely configured radiation fringe velocimeter is used to measure all three components of velocity remotely from a single point. The device is particularly intended for utilization aboard an aircraft, in which case the velocity being measured may be that of aerosol particles or other scattering centers in the free airstream at a location spaced apart from the surface of the aircraft and thus for the most part, free from any associated turbulence effects, etc. The device utilizes known optical techniques for splitting and modulating coherent light into three beam pairs focused onto a common detection volume such that three sets of three-dimensional fringe plane patterns are formed at the detection volume, each of the three sets being aligned along a different fringe plane normal vector and moving in the direction of the corresponding fringe plane normal vector at a different predetermined apparent velocity and/or fringe spacing whereby each of the three different sets of fringe patterns will modulate the intensity of the radiation scattered by an aerosol particle at a fixed location within the detection volume with a characteristic modulation frequency. The beams are oriented with respect to one another at the detection volume such that no two of the three normal vectors associated with the three sets of fringe planes are mutually orthogonal and that all three do not all lie on the same plane.
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Buczinski S. C.
Lockheed Corporation
Smith Frederic P.
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