四频差动激光陀螺腔长敏感性的研究

Cavity length sensitivity in four-mode differential laser gyro

为了改善四频差动激光陀螺的性能,研究了腔长敏感性随温度和工作电流变化的规律。利用气体激光器模牵引效应的经典公式,推导了四频差动激光陀螺腔长敏感性的表达式。通过扫模实验研究了腔长敏感性与温度、放电电流的关系。实验结果表明:温度越高,腔长敏感性越小;放电电流越小,腔长敏感性越小。因此采取较小的放电电流可降低四频差动激光陀螺的腔长敏感性,降低稳频误差的影响。

In order to improve the performance of four mode differential laser gyro, cavity length sensitivity to temperature and gain was studied. Expression of cavity length sensitivity of the four mode differential laser gyro was derived according to mode pulling effect classical equation of gas laser. Cavity length sensitivity to temperature and gain was investigated through cavity length scanning experiment. The results show that when temperature rises, cavity length sensitivity decreases and when gain increases, cavity length sensitivity increases. Therefore, bias error of the four mode differential laser gyro can be reduced according to the results.