Laser accelerometer

Details Laser accelerometer Laser accelerometer

1988-01-20

1989-06-27

Chapman, John

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

356349, G01P 1508

Patent

active

048417742

ABSTRACT:
The apparatus of this invention uses a two-branched linear gas laser having two end mirrors and a third mirror positioned at a bend in the two-branched laser cavity. The laser cavity is bent through an angle, .theta., usually ninety degrees. With a bent cavity, frequency splitting occurs, and that splitting is a function of the angle .theta.. The end mirrors and laser cavities are supported upon two beams relative to the third mirror, and or both of these beams are cantilevered relative to the third mirror. Each flexible beam supports a proof mass. Under acceleration, the angle .theta. changes in a reversible and reproducible manner. The beams are converted into properly oriented planar polarized waves, and the specially polarized beams then are delivered to laser beam sensors to produce electrical output signals that are a measure of the frequency splitting between the two laser modes and a measure of sensed acceleration.

REFERENCES:
patent: 3506362 (1970-04-01), Doyle et al.
patent: 3517560 (1970-06-01), Jacobs et al.
patent: 3800594 (1974-04-01), Hutchings et al.
patent: 4048859 (1977-09-01), Babcock et al.
patent: 4429573 (1984-02-01), Walker
patent: 4438517 (1984-03-01), Bobb et al.
patent: 4635482 (1987-01-01), Walker
patent: 4637255 (1987-01-01), Martin
patent: 4686858 (1987-08-01), Muscatell

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