【作者】 徐莹；

【导师】 王晓曼；

【作者基本信息】 长春理工大学 ， 信息与通信工程， 2011， 硕士

【摘要】 信息通信技术的快速进步,人们的生活也发生了翻天覆地的变化,尤其是光通信技术的进展。但是由于激光在大气中传输时,会相互作用于大气中的各种微粒,产生激光的大气吸收和大气散射效应,这些不可避免的吸收及散射效应,使得光通信中接收端激光的光功率不稳定。本文是利用激光的偏振态的调制光强的知识,延伸到可变激光偏振态的新型光学器件-液晶可变延迟器。利用液晶可变延迟器的电可控性,利用AVR单片机设计的高精度液晶驱动电压源,实现对激光光束能量的自适应控制,稳定激光在大气湍流干扰下的光强。电场的作用下,液晶分子的排列会发生变化,对入射激光的线偏振方向进行柔性调整,在偏振域实现对入射的激光能量的自适应控制,使光探测器接收到的激光能量保持稳定,从而使跟踪系统光探测器工作的信噪比维持稳定,使系统整体达到较高的跟踪精度。更多还原

【Abstract】 With the rapid progress of information and communication technology, people’s lives has undergone enormous changes, especially, the progress of optical communication technology. However,due to transmission of laser in the atmosphere,the interaction of various particles in the atmosphere,resulting in laser atmospheric absorption and atmospheric absorption and atmospheric scattering effects,the inevitable effect of the absorption and scattering,make the laser light power that was received in the optical communication r is not stability.This article is the use of the knowledge that polarization state can modulated laser light intensity, extended to the new variable laser polarization optical devices-liquid crystal variable retarder. Using liquid crystal variable retarder electrical controllability, using AVR microcontroller designed for high-precision LCD drive voltage source to realize the adaptive control of laser beam energy, stable the intensity of laser in atmospheric turbulence.Electric field, the LCD will change the arrangement of molecules on the polarization direction of incident laser line for flexible adjustment of the polarization field of the incident laser energy to achieve adaptive control, so that the light detector receives the laser energy remained stable, tracking system so that the work light detector signal to noise ratio remained stable, so that the whole system to achieve high tracking accuracy.更多还原