基于2倍本征频率调制的光纤陀螺本征频率测量方法

摘要

针对光纤陀螺本征频率测试的问题,提出了一种基于2倍本征频率的低成本解决方法.根据数字闭环光纤陀螺调制、解调的原理,利用2倍本征频率的方波对Y波导进行调制.对解调信号进行分析,得到光电探测器输出脉冲与调制方波频率的关系,将本征频率测试的问题转化成测量脉冲的问题,避免了复杂的软件编程和使用昂贵的测量器件.实验表明利用此方法测试光纤陀螺本征频率,精度可达0.05 kHz.%A low-cost approach is presented to solve the problem of fiber optic gyro(FOG) eigenfrequency measuring. Based on the principles of square wave modulation and demodulation in digital closed-loop FOG, the modulation of Y waveguide has been made by using square wave of double eigenfrequency. The analysis on the demodulated signal gives the relationship between the pulse output of photodetector and the frequency of modulation square wave, so the problem of eigenfrequency measuring is transformed into the problem of pulse measuring when avoiding the use of the complex programming software and expensive measuring devices. Experiment results show that the accuracy could be up to 0.05 kHz when FOG eigenfrequency is measured manually using this method.