Dual wavelength microbend sensor

Details Dual wavelength microbend sensor Dual wavelength microbend sensor

1986-11-17

1988-02-23

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250339, 250227, G01J 100

Patent

active

047272546

ABSTRACT:
A microbend fiber optic sensor uses a dual wavelength to determine the effect of microbending without interference from unwanted signal fluctuations arising from component changes, for example. Periodic microbending losses in single mode, step index fiber optics depend critically upon the wavelength whereby a modulation wavelength can be chosen close to a reference wavelength so that both are affected equally by the unwanted fluctuations but only the modulation wavelength is affected by the microbending. The ratio of the two signals or a log of the ratio yields a value which responds only to the microbend induced signal.

REFERENCES:
patent: 4356396 (1982-10-01), Ruell et al.
patent: 4412722 (1983-11-01), Carnevale et al.
patent: 4567366 (1986-01-01), Shinohara
patent: 4596925 (1986-06-01), Gilby
Marcuse, Dietrich, "Microdeformation Losses of Single-Mode Fibers", Applied Optics, vol. 23, No. 7, 1 Apr. 1984, pp. 1082-1091.

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