Fiber optic system for measuring mechanical motion or vibration

Details Fiber optic system for measuring mechanical motion or vibration Fiber optic system for measuring mechanical motion or vibration

1981-10-02

1983-10-11

Birmiel, Howard A.

Measuring and testing

Vibration

Sensing apparatus

250227, G01H 900, G02B 514

Patent

active

044084951

ABSTRACT:
A system for monitoring vibration or mechanical motion of equipment utilizing an optical waveguide sensor coupled to the equipment. The optical waveguide sensor is formed into a coil or a sinuous path which exceeds the bend radius or critical angle for internally reflected light directed through the waveguide. Vibration or mechanical force imparted to the waveguide from the equipment being monitored further alters the bending losses in the waveguide, and this change in bending losses is used to generate a signal as a function of the vibration or mechanical force.

REFERENCES:
patent: 3709030 (1973-01-01), Aselman
patent: 4235113 (1980-11-01), Carome
patent: 4238856 (1980-12-01), Bucaro et al.
patent: 4358678 (1982-11-01), Lawrence
NASA Tech. Brief Lew-13219, "Lightweight Optics with Digital Output Fiber Optic Accelerometer".

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