论文部分内容阅读
针对棱镜式激光陀螺在抖动状态下出射光强度被调制的现象,系统地研究了机械抖动对棱镜式激光陀螺中光传输轨迹和光电探测器的影响机理.在对现有棱镜式激光陀螺性能进行分析的基础上,应用数值模拟和有限元分析方法,将对称型全反射棱镜纳入四棱镜陀螺的结构设计方案,并给出了由机械抖动引起的应力双折射和光电探测器位置偏移与出射光强度的一般关系.结果表明,机械抖动会使棱镜产生应力双折射,使激光光路发生改变,同时造成光电探测器与出射光束产生相对位移,导致出射光强度幅值产生调制.使用全对称型的陀螺结构,选取具有合适折射率的对称型棱镜,减小探测器与出射光斑中心的相对位移,可以将出射光强度调制幅值相比原先减小52.63%以上,显著地改善出射光强度被调制的现象.此分析结果为提高激光陀螺的可靠性提供了重要参考.
Aiming at the phenomenon that the output laser light intensity is modulated under jittering condition, the mechanism of mechanical dithering on the optical transmission track and photodetector in the prism laser gyroscope is systematically studied. In the performance of the existing prism laser gyroscope Based on the analysis, the design scheme of the symmetrical total reflection prism is introduced into the design of the four-prism gyroscope by numerical simulation and finite element analysis. The stress birefringence caused by the mechanical vibration and the position shift of the photodetector are also given The results show that the mechanical dithering causes the prism to have birefringence and changes the optical path of the laser beam and causes the relative displacement between the photodetector and the outgoing beam, resulting in the modulation of the amplitude of the outgoing light. , The symmetrical prism with suitable refractive index is selected to reduce the relative displacement between the detector and the center of the exiting light spot and the amplitude of the emitted light can be reduced by more than 52.63% Modulation.The results of this analysis provide an important reference for improving the reliability of laser gyro.