Real time velocity determination
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United States of America Patent
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May 24, 1988
Grant Date -
N/A
app pub date -
Jan 17, 1985
filing date -
Jan 18, 1984
priority date (Note) -
Expired
status (Latency Note)
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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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