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    • 2. 发明专利
    • SENSOR
    • JPH05215556A
    • 1993-08-24
    • JP28584492
    • 1992-10-23
    • BODENSEEWERK GERAETETECH
    • BUARUTAA BERUNARUTOGETSUTSU GAISUTAA
    • G01C19/72
    • PURPOSE: To provide a simple and low cost sensor which utilizes non-reciprocal effect. CONSTITUTION: The sensor comprises means 20 and 22 which, utilizing non- reciprocal optical effect, input-combine a passive ring resonator 18 provided with a closed optical path, a light source 10 and the light of a light source 10 with the ring resonator 18 in the first circumferential direction or the second circumferential direction which is opposite to the first one, means 22 and 20 which output-combine the light from the ring resonator 18, and a detecting device 26 to which an output-combined light it applied. Then, the light passing the ring resonator 18 in the first circumferential direction is, for causing interference, superposed on the light which passes the ring resonator 18 in the second circumferential direction, and the detecting device comprises a detector to which the interfered light is applied.
    • 4. 发明专利
    • SENSOR FOR MEASURED VALUE
    • JPH0571971A
    • 1993-03-23
    • JP5035492
    • 1992-03-09
    • BODENSEEWERK GERAETETECH
    • BUARUTAA BERUNARUTOGETSUTSU GAISUTAAMIHIYAERU RAAPU
    • G01C19/72
    • PURPOSE: To enable generating a signal for reproducing a measured value, by coupling an optical ring resonator having a first and a second circulating directions of light, with a semiconductor laser generating an optical wave circulating in the first and the second circulating directions. CONSTITUTION: An optical waveguide fiber 24 forms an external ring resonator 40. For measurement of nonreciprocal effect, the carrier frequency f0 and at least one of the sidebands resonate with the resonator 40. When the nonreciprocal effect is generated in the resonator 40, the resonance function of the resonator 40 is branched on account of the reverse circulation directions of laser 10 lights. The branch Δf is proportional to the nonreciprocal effect. The maximum value of the propagation ratio of the resonator 40 depends upon the case of displaced frequency fL or fR. The phase displacement is generated together with the amplitude displacement. Phase difference Δψ is generated in the resonance region between the laser lights propagating clockwise and counterclockwise. In the case that the difference of signals of detectors 34, 36 is formed and laser light frequency is modulated, the component of a signal is generated together with modulation frequency. The component is the scale for the fluctuation of the optical pass length.