Optical fiber magnetic field sensor with thermal and acoustic is

Details Optical fiber magnetic field sensor with thermal and acoustic is Optical fiber magnetic field sensor with thermal and acoustic is

1981-03-06

1983-03-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

324 96, G02B 514

Patent

active

043784976

ABSTRACT:
An optical fiber sensor for detecting the presence of magnetic fields. Light carrying optical fibers are arranged in the form of a dual path interferometer wherein the separate paths define sensing and reference arms. The sensing arm is associated with magnetostrictive material for defining a sensing element which in the presence of a magnetic field undergoes dimensional changes to stretch the optical fiber to change its optical path length thus causing a detectable phase shift in light passing therethrough when compared with the same light passing through the optical fiber of the reference arm. The sensing element is isolated from thermal and acoustic perturbations thus permitting low frequency magnetic field detection.

REFERENCES:
patent: 3645603 (1972-02-01), Smith
patent: 3701131 (1972-10-01), Brauser et al.
patent: 4147979 (1979-04-01), Baues et al.
patent: 4348587 (1982-09-01), Tangonan et al.
"Magnetic Field Sensing with a Single-Mode Fiber" by Raleigh, Optics Lett, vol. 6, No. 1, Jan. 1981, pp. 19-21.

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