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如何降低光纤陀螺偏振噪声,提高其零偏稳定性在陀螺性能评估和系统结构调整中有着重要的意义。以分析超辐射发光二极管(SLD)偏振度对光纤陀螺性能影响为研究目的,从矩阵光学的琼斯矩阵理论出发,分析Lyot型消偏器的结构参数对光源SLD消偏的影响,完成了对Lyot消偏器结构参数的建模工作,同时提出其最佳结构参数的存在,并进行了计算机仿真和试验验证。首次在Lyot型消偏器的结构参数与光纤陀螺性能之间建立联系,用实验方法验证了之前所给出的结论。研究结果表明:利用光纤消偏器减小光源出射光的偏振度有助于降低光纤陀螺偏振噪声,提高其零偏稳定性。
How to reduce the polarization noise of fiber optic gyros and improve their bias stability is of great significance in the gyroscope performance evaluation and system structure adjustment. In order to analyze the influence of the polarization degree of superluminescent diode (SLD) on the performance of FOG, aiming at the influence of the structure parameters of Lyot type depolarizer on the depolarization of light source, based on Jones matrix theory of matrix optics, Depolarizer structural parameters of the modeling work, while the existence of the optimal structural parameters, and conducted computer simulation and experimental verification. For the first time, the relationship between the structural parameters of the Lyot-type depolarizer and the performance of the FOG was established, and the experimental results validated the previous conclusions. The results show that the use of optical depolarizer to reduce the polarization degree of the light emitted by the light source helps to reduce the polarization noise of the fiber optic gyros and improve the stability of the bias.