热传递对异面腔四频差动激光陀螺温度漂移补偿的影响

为了减小四频激光陀螺零漂的温度敏感性，对数学补偿模型和安装结构热设计进行了研究。通过高低温实验研究了四频激光陀螺零漂与温度的关系。第一次采用普通铜支架将四频激光陀螺固定在屏蔽盒内，由于两放电支路的温度变化不对称，温度变化率是数学补偿模型的显著项。第二次设计了专用铜支架，使两放电支路的温度对称地变化，因而温度变化率在数学补偿模型中的重要性大大降低。改进支架之后，补偿后的零漂残差从0.018 Hz降低到0.01 Hz，即便采用温度多项式补偿模型也能达到0.012 Hz。这些结果表明:在设计四频激光陀螺系统时，安装结构热设计能够提高数学模型补偿的效果，温度补偿是提高四频激光陀螺的精度的有效方法，在-40~60℃温度范围内补偿后的百秒标准差达到0.013/（（）h）。

Influence of thermal transfer on temperature drift compensation in nonplanar four-frequency differential laser gyros

In order to reduce the temperature sensitivity of the zero drift in four-frequency differential laser gyro (FFDLG), the mathematical compensation model and the thermal design of the installation structure were studied. The relationship between zero drift and temperature of the FFDLG was studied by high and low temperature tests. In the first test, the FFDLG was fixed in the shielding box by an ordinary copper support. Due to the asymmetry of the temperature changes in the two discharge branches, the temperature change rate was a significant term of the mathematical compensation model. In the second test, a special copper support was designed to make the temperature in the two discharge branches change symmetrically, so the importance of temperature change rate in the mathematical compensation model was greatly reduced. After the support was improved, the root mean square (RMS) of residual bias after compensation decreased from 0.018 Hz to 0.01 Hz. Even if only a polynomial of temperature was used in the compensation model, an RMS of residual bias of 0.012 Hz could be achieved. The results show that:when designing FFDLG system, the thermal design of the installation structure can improve the compensation effect of the mathematical model. Temperature compensation is an effective method to improve the accuracy of the FFDLG. An FFDLG with an RMS of residual bias of 0.013 ()/h in the range of -40-60℃ was obtained after improvement in the installation structure and temperature compensation.