Phase detection laser accelerometer

Details Phase detection laser accelerometer Phase detection laser accelerometer

1982-03-25

1984-01-31

Gill, James J.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

73653, G01P 1508

Patent

active

044282346

ABSTRACT:
An accelerometer utilizes a laser source, a photoelastic waveguide, a plurality of optical beam paths and detectors for processing optical output energy from the laser along two or more paths for providing phase detection for measuring acceleration. An electronic signal processing section converts the optical signals to electrical signals and provides an output for indicating circuitry. Formed in a micro-optical/integrated optic format, the accelerometer can be packaged in a small volume which allows ready use in systems for guidance or navigation purposes. Light generated by the laser is divided into two or four beam paths. Beam energy is directed through the photo-elastic waveguides and are selectively recombined to set up interference conditions. Subjecting the waveguide to acceleration stress will cause a detectable phase difference to occur which is indicative of acceleration.

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