论文部分内容阅读
光纤陀螺是干涉型传感器,光的偏振特性影响该传感器的精度,因此需要对光纤的偏振态进行精确的测试。目前国外有些公司出售检偏系统,但所给的指标并不高,而且价格也非常昂贵,国内使用的测试系统一般都为自制,精度普遍不高,实际测量的消光比小于系统的理论消光比。有偏振特性系统的设计和测试结果,却没有系统误差原因的详细分析。针对这一问题,在给出了高精度保偏光纤偏振测试系统的光路结构基础上,对系统中影响消光比的光路误差进行了分析和计算。通过理论分析和计算机模拟计算,得到本系统的消光比在给定的误差范围内可以达到55 dB,能够满足高精度的测量。同时,在计算中得到了e光和o光的透射率,计算结果中棱镜e光的透射率比以往的结果精确2.34%。
Fiber optic gyroscopes are interference sensors. The polarization characteristics of light affect the accuracy of the sensor. Therefore, the polarization state of the fiber needs to be accurately tested. At present, some foreign companies sell the inspection system, but given the index is not high, but the price is very expensive, domestic test systems are generally self-made, the accuracy is generally not high, the measured extinction ratio is less than the theoretical extinction ratio . Polarization characteristics of the system design and test results, but no systematic analysis of the causes of error. In view of this problem, the optical path error of the polarization extinction ratio in the system is analyzed and calculated on the basis of the optical structure of high precision polarization-maintaining optical fiber polarization test system. Through theoretical analysis and computer simulation, the extinction ratio of the system can be achieved within the given error range of up to 55 dB, to meet the high-precision measurements. At the same time, the transmissivity of e-light and o-light was obtained in the calculation, and the transmissivity of the prism e light was 2.34% more accurate than previous results in the calculation results.