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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 the four-frequency differential laser gyroscope, the variation of cavity length sensitivity with temperature and operating current was studied. Based on the classical formula of the gas laser mode drag effect, the expression of the cavity length sensitivity of the quadrupole differential laser gyroscope is deduced. The relationship between cavity length sensitivity and temperature and discharge current was studied by scanning experiments. Experimental results show that: the higher the temperature, the smaller the cavity length sensitivity; the smaller the discharge current, the smaller the cavity length sensitivity. Therefore, a smaller discharge current can reduce the cavity length sensitivity of quad-band differential laser gyros and reduce the influence of frequency stabilization error.