Method and apparatus for measuring a relative movement between two elements
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United States of America Patent
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Jul 30, 1996
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N/A
app pub date -
Feb 24, 1995
filing date -
Feb 28, 1994
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Abstract
For measuring an amount of relative movement between two elements, such as a vehicle and a track, which are mutually movable, two successive pulses of coherent light are directed from the vehicle to the track under a same incidence angle. From a same location of the vehicle, two images of the interference patterns due to the short pulses are formed. The two pulses are offset from each other in the direction of movement by a distance d approximately corresponding to the amount of relative movement between the two pulses. The actual amount of movement is computed as being the movement which provides the best coincidence between the two images. The comparison can be made by cross-correlation.
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