Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1985-01-17
1988-05-24
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
128691, G01P 336, A61B 502
Patent
active
047462116
ABSTRACT:
Method and apparatus for determining the velocity of an object in a given direction without contacting the object, by: directing coherent radiation to the object in a direction substantially perpendicular to the given direction to cause radiation to be scattered from the object to produce a speckle pattern exhibiting a speckle spectrum, the speckle pattern at a location spaced from the object having a time dependency which is a function of movement of the object, detecting the speckle pattern intensity at the location spaced from the object, producing a first signal representative of the detected speckle intensity, and producing, from the first signal, a time-dependent intensity signal having a value which is weighted as a function of the frequency of the first signal.
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Ohtsubo et al, "Velocity measurement of a diffuse object using time-varying speckles," Optical and Quantum Electronics, Nov. 1976, pp. 523-529.
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Ohtsubo, J. and T. Asakura, Optical and Quantum Electronics 8, "Velocity measurement of a diffuse object by using time-varying speckles, 1976, pp. 523-529.
Haina Diether
Ruth Bernhard
Waidelich Wilhelm
Buczinski Stephen C.
Gesellschaft fur Strahlen- und Unweltforschung mbH
Wallace Linda J.
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