Passive laser accelerometer

Details Passive laser accelerometer Passive laser accelerometer

1979-07-02

1980-11-18

Gill, James J.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

356 33, G01P 1508, G01B 1118

Patent

active

042338476

ABSTRACT:
An accelerometer utilizing a laser source and a resonant cavity formed by a pair of spaced mirrors. A birefringent isotropic material is disposed in the resonant cavity. Light generated by the laser is reflected back and forth between the mirrors and through the birefringent material to generate a pair of orthogonally polarized beams. The optical path of one beam is changed in response to acceleration forces acting on a proof mass carried on the birefringent material. The pair of beams produced have different phases. The phase difference will be by an amount proportional to the difference in refractive indexes along and perpendicular to the optic axis of the birefringent material.

REFERENCES:
patent: 3800594 (1974-04-01), Hutchings et al.
patent: 4155251 (1979-05-01), Lautzenhiser

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