Method of position monitoring and apparatus therefor
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United States of America Patent
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-
Aug 21, 1990
Grant Date -
N/A
app pub date -
Nov 14, 1988
filing date -
Nov 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Displacement or strain is measured by applying to a body to be monitored at least one grid line (two or more where strain measurements are required) and scanning a radiation beam such as a laser beam across or partly across the grid line(s) to produce a pulsed output from which the mean position(s) of the grid line(s) can be ascertained with reference to a datum point on the beam scanning path. Displacement of each grid line relative to the datum point can be determined. The beam scan may be adjustable to produce a null condition in which the mean position of the grid line(s) coincides with the mid-point of the beam scan. Any deviation from the null condition then indicates displacement of the body or strain thereof.
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