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为了解决光强差稳频系统易受光电元件参量影响的问题,设计了一套用于异面腔四频差动激光陀螺的小抖动稳频系统。采用高频放大和幅度检波电路检出四频差动激光陀螺顺时针(或逆时针)输出光束的拍频幅度,然后用模数转换器采集到数字信号处理器(DSP)内。四频差动激光陀螺正常工作时拍频幅度取极大值,因此可通过对腔长进行小抖动调制实现稳频。利用DSP设计了一套数字式稳频系统,1 s取样的稳频精度为2×10-9,更重要的是稳频点不受光电元件参量变化的影响。设计的小抖动稳频电路精度高、通用性好,对提高四频差动激光陀螺适应恶劣环境的能力有一定的价值。
In order to solve the problem that the light intensity difference frequency stabilization system is easily influenced by the parameters of the optoelectronic components, a set of small jitter frequency stabilization system is designed for the four-frequency differential laser gyroscope. Using high-frequency amplification and amplitude detection circuit detected quad-band differential laser gyro clockwise (or counterclockwise) beat frequency of the output beam, and then use the analog-to-digital converter to capture the digital signal processor (DSP). Quadruple differential laser gyro normal working frequency beat frequency to take the maximum value, so the cavity length can be small jitter modulation to achieve frequency stabilization. Using DSP to design a digital frequency stabilization system, 1s sampling frequency stabilization accuracy of 2 × 10-9, more importantly, the frequency stabilization point is not affected by changes in the parameters of the optoelectronic components. Small jitter frequency stabilization circuit design of high precision, good versatility, to improve the four-frequency differential laser gyro to adapt to the harsh environment has a certain value.