초록 ▼

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-maintaini

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.

대표청구항 ▼

In a single-polarization fiber optics magnetic sensor comprising: a light source; a Faraday rotation element; a photo-detector; and optical waveguide means for optically coupling together said light source, Faraday rotation element and photo-detector; the improvement wherein: said optical waveguide

In a single-polarization fiber optics magnetic sensor comprising: a light source; a Faraday rotation element; a photo-detector; and optical waveguide means for optically coupling together said light source, Faraday rotation element and photo-detector; the improvement wherein: said optical waveguide means comprises polarization-maintaining optical fibers coupled to opposite sides of said Faraday rotation element without a polarizer and without an an analyzer interposed between said Faraday rotation element and said respective polarization-maintaining optical fibers, said optical fibers serving only as an optical waveguide for transmitting optical signals.