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    • 10. 发明授权
    • Fiber optic rate sensor
    • 光纤速率传感器
    • US4717256A
    • 1988-01-05
    • US891809
    • 1986-07-21
    • Donald EnsleyHiroshi Satake
    • Donald EnsleyHiroshi Satake
    • G01C19/72G02F1/01G01B9/02G01C19/64
    • G01C19/721G02F1/0134
    • In a fiber optic rate sensor employing a Sagnac ring circuit wherein an ocal source launches an optical signal which is divided into two equals signals which are coupled in opposite directions through a multi-turn fiber optic coil to provide two counter-propagating optical signals. The two counter-propagating optical signals are coupled to a photodetector after passing through the multiturn fiber coil. The signals detected at the photodetector have traversed identical optical paths between said source and said photodetector and have undergone a Sagnac phase shift directly related to the rate of rotation of the fiber coil about its axis in inertial space. The two counterpropagating signals are phase modulated by a phase modulator at one end of the fiber optic coil and the output of the photodetector undergoes signal processing in a signal processor to produce a rate output directly related to the rate of rotation of the fiber coil. The improvement being an improved phase modulation and signal processor which comprises a crystal-controlled oscillator providing a sine wave reference signal means for coupling the crystal of the crystal-controlled oscillator to the optical fiber at one end of the coil to produce a non-reciprocal phase modulation of the counter-propagating optical signals, means for multiplying the sine wave reference signal and the output from the photodetector to produce a product output, and means for integrating the product output over a whole number of complete reference cycles to produce the rate output, the sine wave reference signal being coupled to means for integrating to control the integration period of the means for integrating.
    • 在采用Sagnac环电路的光纤速率传感器中,其中光源发射光信号,该光信号被分成两个等于通过多匝光纤线圈以相反方向耦合的信号,以提供两个反向传播的光信号。 两个反向传播的光信号在通过多圈光纤线圈之后耦合到光电检测器。 在光电检测器处检测到的信号已经穿过所述源和所述光电检测器之间的相同的光路,并且在惯性空间中经历与纤维线圈绕其轴线的旋转速率直接相关的Sagnac相移。 两个反向传播信号由光纤线圈的一端的相位调制器进行相位调制,并且光电检测器的输出在信号处理器中进行信号处理,以产生与光纤线圈的转速直接相关的速率输出。 该改进是改进的相位调制和信号处理器,其包括晶体振荡器,其提供正弦波参考信号装置,用于将晶体振荡器的晶体耦合到线圈一端处的光纤以产生不可逆的 反向传播光信号的相位调制,用于将正弦波参考信号和来自光电检测器的输出相乘以产生乘积输出的装置,以及用于在整个数量的完整参考周期上积分乘积输出以产生速率输出的装置 正弦波参考信号被耦合到用于积分的装置以控制用于积分的装置的积分周期。