Fiber optic accelerometer and method of measuring inertial force

Details Fiber optic accelerometer and method of measuring inertial force Fiber optic accelerometer and method of measuring inertial force

1980-09-11

1982-03-30

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

367149, 350 9629, 73653, G01V 118, G01D 526

Patent

active

043228291

ABSTRACT:
A mass is attached between light reflective ends of a pair of rectilinearly aligned optic fibers and maintained in such position with the fibers under a slight tension. The pair of fibers comprise a portion of two arms of a Mach Zehnder or Michelson interferometer so that an acceleration along the longitudinal axis of the rectilinearly aligned optic fibers increases the length of one of the pair of fibers and shortens the length of the other, whereby electromagnetic rays traveling in the pair of fibers, travel different distances resulting in a phase shift which phase shift is directly proportional to the force applied to the fibers by the mass and therefore directly proportional to the acceleration. Accelerations in directions perpendicular to the longitudinal axes of the fibers cause equal phase shifts in each arm and therefore would not be detected. Thermal expansion of the fibers and acoustical noises should also balance out.

REFERENCES:
patent: 2984110 (1961-05-01), Simek
patent: 3961185 (1976-06-01), Brokershire et al.
patent: 4071753 (1978-01-01), Fulenwider et al.
patent: 4185503 (1980-01-01), Saito
Tueten et al., "Fiber Optic Accelerometer", 10/23/80, pp. 854-856, Electronics Letters, vol. 16, #22.
Giallorenzi, "Fiber Optic Sensors", 4/81, pp. 73-78, Optics and Laser Technology", vol. 13, #2.
"Fiber-Optic Accelerometer with Hydrophone Applications", by Rines, 10/1/81, Applied Optics, vol. 20, #19.

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