高精度激光陀螺磁效应的理论与实验研究

项目名称： 高精度激光陀螺磁效应的理论与实验研究

项目编号： No.61078017

项目类型： 面上项目

立项/批准年度： 2011

项目学科： 无线电电子学、电信技术

项目作者： 袁杰

作者单位： 中国人民解放军国防科学技术大学

项目金额： 18万元

中文摘要： 本项目利用激光物理原理和矩阵光学方法，针对目前我国精度最高的正方形谐振腔二频机抖激光陀螺，系统深入的研究了其磁效应规律。理论上通过系统分析谐振腔结构、谐振腔异面误差、谐振腔反射膜片性能、各反射片由于应力导致的双折射效应和作用在增益区的外加磁场的大小与方向等诸多因素对激光陀螺磁效应的影响，分析研究并掌握了激光陀螺磁效应受多种因素影响的规律.设计研制了顺逆时针双光路椭圆度测量系统，并实现了顺逆时针椭圆度的精确测量，考虑到输出片应力的影响，我们发现R. H. Moore提出的通过监控使顺逆时针输出光椭圆度相等来降低磁效应的准直方法的不可行性。本项目最终从陀螺装调实验上找到了一种切实可行的有效显著降低激光陀螺磁效应的方法，对磁敏感相对较大的陀螺，采用此方法，其磁敏感可以降低到原来的1/10。克服了传统磁屏蔽方法降低磁效应的严重不足，从而满足了我国高精度激光陀螺研制的迫切需求。另外,本项目从轻微非共面腔拓展开，进行了通用性非共面腔的初步理论研究，这对新型异面谐振腔四频差动激光陀螺研究有重要价值.

中文关键词： 激光技术；正方形谐振腔；非共面角；磁效应；高精度激光陀螺

英文摘要： By utilizing the principles of laser physics and methods of matrix optics, this project has give a systematical research on the magnetic effect of high accuracy two-frequency dithered ring laser gyro which has a square ring resonator. The affection of the parameters such as cavity construction, non-planar errors of the cavity, stress birefringence effect of mirrors, the characteristic of the mirrors, the orientation and magnetitude of magnetic field to the magnetic effect have been analyzed. The relationship between the magnetic sensitivity and those parameters has bee analyzed and obtained. A system for measuring the ellipticities of the clockwise and counterclockwise output beam has been designed and the ellipticities of the clockwise and counterclockwise output beam are accurately measured simultaneously. With the consideration of the output mirror’ stress effect, the alignment method to decrease the magnetic bias by reducing the distortion angle to 0 when the ellipticities of clockwise and counterclockwise output beams are equivalent, which is proposed by R. H. Moore has been found ineffective. Finally, a novel assembly method to eliminate magetic bias effectively has been proposed and it has been approved by related experiments. For the laser gyro with big magetic bias, its magnetic bias can be reduced to 10 percent of original bias by utilizing this novel assembly method. The fatal deficiency of traditional method which utilizing magnetic shield has been overcome and the urgent demand of the research on high accuracy ring laser gyros has been satisfied. In addition, a preliminary theoritical research has been given to the generalized non-planar ring resonators which is the extension of the little non-planar ring resontor in this project, and this research is valuable for the research on non-planar multioscillator ring laser gyroscopes.

英文关键词： Laser technology; square ring resonators; distortion angle; magnetic effect; high precision laser gyros