论文部分内容阅读
为了提高四频差动激光陀螺的精度,对其左右旋模式光学解调分离方法进行了理论分析和实验研究。根据陀螺输出光偏振特性,分析了椭圆偏振误差对左、右旋模式光学解调分离的影响机理。定义了分离后左、右旋模式输出信噪比,对该影响进行了量化,信噪比越大对解调输出影响越小。基于仿真计算和实验验证,给出光学解调系统中偏振片安装角度与输出信噪比的关系,指出调节偏振片安装角度是一种工程上有效提高信噪比的方法,并提出一种新的偏振片角度选取的分离方法——剔除法。与该陀螺研制初期的提取法获得的信噪比进行了对比,理论计算和实验结果一致表明,剔除法优于提取法。
In order to improve the accuracy of four-frequency differential laser gyroscope, theoretical analysis and experimental research on the optical demodulation methods of left-right spin-mode optical demodulation are carried out. According to the polarization characteristics of gyro output light, the influence mechanism of elliptical polarization error on the optical demodulation and separation of the left and right-handed modes is analyzed. The signal-to-noise ratio of left and right-handed output after the separation is defined, and the influence is quantified. The larger the signal-to-noise ratio is, the smaller the influence on the demodulation output is. Based on the simulation calculation and experimental verification, the relationship between the installation angle and the output signal-to-noise ratio of the polarizer in the optical demodulation system is given. It is pointed out that adjusting the installation angle of the polarizer is an effective way to improve the signal to noise ratio in engineering and proposes a new Polarizer angle selection method of separation - culling method. Compared with the signal-to-noise ratio obtained from the initial extraction method of the gyro, the theoretical calculation and experimental results show that the rejection method is superior to the extraction method.