G - Physics – 01 – P
Patent
G - Physics
01
P
73/42
G01P 15/09 (2006.01) G01H 9/00 (2006.01) G01P 15/093 (2006.01)
Patent
CA 1326602
ABSTRACT OF THE DISCLOSURE A vibration sensor (24) is disclosed which uses a piezoelectric crystal (26) to electrically modulate the phase of a laser beam using a phase modulator (28) producing a linearly phase modulated light beam. A DC bias can be provided by a battery (60) while a photocell (64) can provide the DC bias along with a calibration signal. The sensitivity of the sensor (24) can be doubled by passing the light beam through the sensor (24) twice using a reflector (74). By routing optical fibers (20, 22 and 31) carrying a reference beam and a sensing beam along the same physical path mechanical stress effect noise can be removed.
603035
Bereskin & Parr
Westinghouse Electric Corporation
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