发明授权
US5455676A Method of detecting a signal and modulation coefficient of a
phase-modulated fiber-optic gyroscope based on a difference in the
duration of multiple subwaves in a modulation period
失效
基于在调制周期中的多个子波的持续时间的差异来检测相位调制光纤陀螺仪的信号和调制系数的方法
- 专利标题： Method of detecting a signal and modulation coefficient of a phase-modulated fiber-optic gyroscope based on a difference in the duration of multiple subwaves in a modulation period
- 专利标题（中）： 基于在调制周期中的多个子波的持续时间的差异来检测相位调制光纤陀螺仪的信号和调制系数的方法
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申请号： US201459申请日： 1994-02-24
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公开(公告)号： US5455676A公开(公告)日： 1995-10-03
- 发明人: Yozo Nishiura , Yasuhiko Nishi
- 申请人： Yozo Nishiura , Yasuhiko Nishi
- 申请人地址： JPX Osaka
- 专利权人： Sumitomo Electric Industries, Ltd.
- 当前专利权人： Sumitomo Electric Industries, Ltd.
- 当前专利权人地址： JPX Osaka
- 优先权： JPX5-061169 19930224; JPX6-013145 19940110
- 主分类号： G01C19/72
- IPC分类号： G01C19/72
摘要：
An AC component of the photodetector includes two quasi-sine waves in a cycle of phase-modulation. T.sub.1 and T.sub.2 are time lengths of the quasi-sine waves. When a fiber coil is rotating, T.sub.1 differs from T.sub.2. The difference between T.sub.1 and T.sub.2 is in proportion to an angular velocity of the fiber coil. This invention obtains the angular velocity by measuring time durations T.sub.1, T.sub.2 or both T.sub.1 and T.sub.2. Zero-crossing detection defines the moments of the beginning and the end of T.sub.1 and T.sub.2. Since this gyroscope depends on the measurement of time lengths, it is fully immune from the fluctuation of light power due to the light source, or the fluctuation of the gain in the electric circuit.
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