Method and apparatus for positioning object in space using a low-coherence laser beam which is reflected by two references to sharpen the interference fringe lines
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United States of America Patent
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-
May 16, 2000
Grant Date -
N/A
app pub date -
Aug 27, 1997
filing date -
Aug 27, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An object is positioned in space by using a beam splitter to split a low-coherence laser light beam into a probe beam and a reference beam. The probe beam is projected at the target object, while the reference beam is reflected by a pair of mirrors synchronized along light paths and scanned at different amplitudes, to form two beams of equal intensity, and light reflected by the object and the interference fringes are detected together to obtain fringe signals with sharpened profile lines.
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