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    • 4. 发明授权
    • Interference sensor and method utilizing extracted alliasing frequency
components
    • 干涉传感器和方法利用提取的各向异性频率分量
    • US5264914A
    • 1993-11-23
    • US11833
    • 1993-02-01
    • Shigeru OhoHisao SonobeJunichi MakinoHiroshi KajiokaTatsuya Kumagai
    • Shigeru OhoHisao SonobeJunichi MakinoHiroshi KajiokaTatsuya Kumagai
    • G01C19/72
    • G01C19/72
    • An interference sensor passes radiation from a source and a polariser to a loop of optical fiber so that radiation beams circulate in opposite directions around the loop and interfere. The loop contains an optical phase modulator which imposes an optical modulator on the radiation beams circulating on the loop. A converter detects the interfering and modulated beams and generates an interference signal which is then processed by an analyser. The interference in the loop is dependent on rotation of the loop and therefore analysis of the interference signal permits that rotation to be measured. In the present invention, the interference signal is (i) sampled at a frequency different from that of the optical modulation, or (ii) electronically modulated in the analyser at a frequency different from that of the optical modulation, or (iii) optically modulated in the loop at a second optical modulation frequency. The analysis in the analyser may be in the frequency domain (i.e. consideration being given to the frequency of the interference signal) or in the time domain (i.e. independent of frequency).
    • 干扰传感器将来自源极和偏振器的辐射传递到光纤环,使得辐射束在环绕环路的相反方向上循环并且干涉。 该环路包含光学相位调制器,该光相位调制器在循环中的辐射束上施加光学调制器。 A转换器检测干扰和调制的波束并产生干扰信号,然后由分析仪进行处理。 环路中的干扰取决于环路的旋转,因此干扰信号的分析允许测量旋转。 在本发明中,干扰信号是(i)以与光调制不同的频率进行采样,或者(ii)在分析仪中以与光调制不同的频率进行电子调制,或(iii)光调制 在第二光调制频率的环路中。 分析仪中的分析可能处于频域(即考虑到干扰信号的频率)或时域(即独立于频率)。