Wide bandwidth fiber optic accelerometer

Details Wide bandwidth fiber optic accelerometer Wide bandwidth fiber optic accelerometer

1988-06-20

1990-02-13

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 73517R, 73517AV, G01P 1509, G01B 1100

Patent

active

049009192

ABSTRACT:
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.

REFERENCES:
patent: 4085349 (1978-04-01), Farstadt
patent: 4233847 (1980-11-01), Walker
patent: 4428234 (1984-01-01), Walker
patent: 4671113 (1987-06-01), Carome

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