光纤陀螺中一种光相位差跟踪方法

A Differential Optic Phase Tracing Method in Fiber Optic Gyro

对光纤陀螺中光相位差的检测是得到所需角速度的基础。简要分析了陀螺输出信号的特点 :噪声大、非线性、周期性 ,以及这些特点对检测有效信号的影响。提出了一种单通道光相位差跟踪的方法。这种方法采用正弦调制 ,通过对信号 (包括输出信号和跟踪信号 )的三角和乘法运算 ,并在必要的环节进行滤波得到光相位差。它能够解决光纤陀螺动态范围和刻度因子线性度问题 ,并具有简明、成本低、易实现的特点。最后进行了相位跟踪的计算机模拟和电路的实现 。

The fundamental step to acquire the rotation rate of fiber optic gyro (FOG) is to detect the differential optic phase. The characters of FOG’s output signal which are with large noise, nonlinear, periodic and their consequences to the detection of the effective signal are analyzed briefly. Here a tracing of differential optic phase is presented and sin modulation is adopted in the method, triangular operator is applied and finally the rotation signal is gotten after multipling on FOG output and the tracing signal, and adding filters to where they are needed. With this method the dynamic range and the linear of scale factor of FOG are improved. It also has the advantages of simple, low cost and easy to accomplished. The phase tracing simulation and the test circuit are made and the results are given.