Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-08-09
1985-05-07
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, 324 96, G02B 514
Patent
active
045160210
ABSTRACT:
An optical fiber magnetometer utilizing, in one embodiment, a birefringment optical fiber in combination with a magnetostrictive block for inducing strains in the fiber in response to an applied magnetic field to thereby cause a change in the degree of birefringence of the fiber. This change in birefringence is measured by directing the light exiting the fiber through a conversion element such as a polarizer or a prism and then detecting the resulting intensity modulation in a photodetector.
A variety of inventive features are set out in this disclosure including the use of spliced fibers with a 90 degree axis rotation to compensate for environmental effects, the use of a twisted fiber for gradient field sensing, and the rotation of the sensor fiber to eliminate low-frequency noise and to obtain a vector field and field gradient sensing capability.
REFERENCES:
patent: 3693082 (1972-09-01), Jaecklin
patent: 4173412 (1979-11-01), Ramsay et al.
patent: 4255018 (1981-03-01), Ulrich et al.
patent: 4269483 (1981-05-01), Feldtkeller
patent: 4298245 (1981-11-01), Aulich et al.
patent: 4370612 (1983-01-01), Puech et al.
patent: 4442350 (1984-04-01), Rashleigh
Beers Robert F.
Ellis William T.
Nelms David C.
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