Distributed multiplexed optical fiber Bragg grating sensor arran

Details Distributed multiplexed optical fiber Bragg grating sensor arran Distributed multiplexed optical fiber Bragg grating sensor arran

1989-12-26

1991-02-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023110, 356 32, H01J 516

Patent

active

049964194

ABSTRACT:
An arrangement for determining the magnitudes of selected physical quantities at a multitude of spaced locations includes an elongated optical fiber having a multitude of separate longitudinally spaced Bragg sensing gratings of substantially identical initial periodicity situated at such locations. Light pulses are launched into the core for propagation longitudinally thereof and for return from any of the sensing gratings of a detectable light echo at a central wavelength determined by the instantaneous value of the periodicity of the respective sensing grating that depends on the longitudinal stress applied to such grating as a result of the action of the physical quantity being monitored at the location of such grating. The light echoes are detected and allocated to the respective sensing gratings on the basis of time intervals elapsed between the issuance of the respective light pulses and the arrival of the echoes responsive thereto, and to the respective longitudinal stresses applied to the respective sensing gratings on the basis of the respective wavelengths of the echoes returned from the respective gratings.

REFERENCES:
patent: 3458257 (1969-07-01), Pryor
patent: 4577100 (1986-03-01), Meltz et al.
patent: 4653906 (1987-03-01), Dunphy et al.
patent: 4692610 (1987-09-01), Szuchy
patent: 4717253 (1988-01-01), Pratt, Jr.
patent: 4761073 (1988-08-01), Meltz et al.
patent: 4763009 (1988-08-01), Fevrier et al.
patent: 4806012 (1989-02-01), Meltz et al.

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