Single-polarization fiber optics magnetic sensor

Details Single-polarization fiber optics magnetic sensor Single-polarization fiber optics magnetic sensor

1983-12-07

1986-04-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

324 96, 356365, 350 9630, G01B 1100

Patent

active

045844704

ABSTRACT:
In a single-polarization fiber optics magnetic sensor comprising a light source, a Faraday rotation element, a photodetector, and optical waveguide means for optically coupling them; according to a first embodiment, the optical waveguide means comprises upstream and downstream polarization-maintaining optical fibers coupled to the entrance and exit of the Faraday rotation element without a polarizer or an analyzer interposed therebetween; according to a second embodiment, in addition thereto, the axis of polarization of the downstream polarization-maintaining optical fiber is at an angle of about 45 degrees with respect to the orientation of the linearly polarized light exiting from the Faraday rotation element at a magnetic field intensity H equal to 0; and according to a third embodiment, in addition thereto, a polarization beam splitter is located in alignment with the orientation of polarization of the exit light from the downstream polarization-maintaining optical fiber, and two polarized light beams produced by said beam splitter are received by two photo-detectors for subsequent signal computation.

REFERENCES:
patent: 4298245 (1981-11-01), Aulich et al.
patent: 4415230 (1983-11-01), Keck
patent: 4426129 (1984-01-01), Matsumura et al.
patent: 4442350 (1984-04-01), Rashleigh
patent: 4468090 (1984-08-01), Ulrich et al.
Rashleigh, "Magnetic-Field Sensing with a Single-Mode Fiber", Optics Letters, Jan. 1981, vol. 6, No. 1, pp. 19-21.

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