Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-03-08
1984-09-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
324244, 324260, 250231R, G02B 514
Patent
active
044712197
ABSTRACT:
A magnetic field sensor for detecting a magnetic field perturbation while nulling out variations in the signal caused by acoustic perturbations comprising a first and second optical fibers, an adjustable optical coupler for coupling light therebetween, a magnetic component attached to the optical coupler for exerting a mechanical force thereon proportional to a magnetic field perturbation to thereby change the degree of coupling between the fibers, and an optical detector for determining the amount of light actually being coupled between the fibers. As noted above, the system includes an acoustic circuit for nulling out the response in the detector signal due to acoustic perturbations. Two separate embodiments are disclosed. A first embodiment modulates the axial alignment of fibers in an end-to-end configuration by means of a magnetic material. A second embodiment modulates the evanescent coupling between the fibers disposed in parallel adjacency via a magnetostrictive material.
REFERENCES:
patent: 4147979 (1979-04-01), Baues et al.
patent: 4368430 (1983-01-01), Dale et al.
patent: 4371838 (1983-02-01), Griscom
patent: 4376248 (1983-03-01), Giallorenzi et al.
patent: 4414471 (1983-11-01), Rines
"Fiber Optic Sensor System Technology Assessment" by DSI, DSI-TR-80-001, . 1, 1980.
Beers Robert F.
Brophy J.
Ellis William T.
Nelms David C.
The United States of America as represented by the Secretary of
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