Fiber optics transducers for sensing parameter magnitude

Details Fiber optics transducers for sensing parameter magnitude Fiber optics transducers for sensing parameter magnitude

1983-09-08

1984-09-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, G02B 514

Patent

active

044726287

ABSTRACT:
A transducer for sensing the magnitude of a parameter, such as mechanical displacement/motion, pressure, temperature, electrical voltage, current and the like, uses a multimode optical waveguide fiber. At least one portion of the fiber is subjected to bending in an amount changing with a change in the sensed parameter magnitude. The resulting microbending losses in the fiber vary the attenuation of light energy between an optical source and an optical detector, response to variations in the sensed parameter magnitude. The variations of the detector output may be monotonically continuous, or may be processed to assume one of a pair of levels for "on-off" switching purposes.

REFERENCES:
patent: 4019051 (1977-04-01), Miller
patent: 4071753 (1978-01-01), Fulenwider et al.
patent: 4275295 (1981-06-01), Menningen et al.
patent: 4294513 (1981-10-01), Nelson et al.
patent: 4342907 (1982-08-01), Macedo et al.
patent: 4358678 (1982-11-01), Lawrence

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