Fiber optical monitor for detecting motion based on changes in s

Details Fiber optical monitor for detecting motion based on changes in s Fiber optical monitor for detecting motion based on changes in s

1991-12-06

1993-05-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023716, H01J 4014

Patent

active

052123790

ABSTRACT:
A motion monitor using coherent or partially coherent light passing through an optical fiber which is in contact or close to an object whose motion is to be monitored. An optical speckle pattern is formed near the output of the optical fiber which pattern changes as the fiber moves in response to the motion of the object being monitored. An optical detector monitors all or a part of the speckle pattern and electronically processes the optical detector's electrical output signals to derive information on the status of the object being monitored.

REFERENCES:
patent: 4297684 (1981-10-01), Butter
patent: 4339661 (1982-07-01), Pitt et al.
patent: 4843233 (1989-06-01), Jeunhomme
Eric G. Rawson and Joseph W. Goodman, Modal noise in multimode optical fibers, 1982, Society of Photo-Optical Instrumentation Engineers (SPIE) vol. 355, Fiber Optics: Short-Haul and Long-Haul Measurements and Applications, pp. 37-42.
Joseph W. Goodman and Eric G. Rawson, Statistics of Modal Noise in Fibers: a case of constrained speckle, Jul. 1981, Optics Letters, vol. 6, p. 324.

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