【作者】 李进；

【导师】 骆丽；

【作者基本信息】 北京交通大学 ， 微电子学与固体电子学， 2011， 硕士

【摘要】 摘要：三通道双折射滤光器是研究太阳物理的主要光学仪器,双折射滤光器的发明和应用大大地促进了太阳单色观测,特别是太阳活动区的观测。滤光器中透光晶体材料的折射率对温度要求敏感,要求工作温度恒定为42℃,对于要求精度为0.1km/s的视向速度场的测量,最厚的冰洲石级的恒温精度应为0.01℃。三通道滤光器要求内部晶体最大温差不超过0.15℃。本论文的主要工作对三通道滤光器进行热分析,根据分析结果对滤光器的结构和温控设计提出策略,并实现了三通道滤光器的改进后的温控系统。本论文的主要研究成果如下：(1)对三通道滤光器在ANSYS中建模进行验证,建立了合理完整的三通道滤光器有限元模型；(2)分析了不同环境条件对三通道滤光器内部晶体温度分布的影响,外部环境的变化要求调整加热功率控制内部晶体恒定在42℃,但是加热功率的改变影响了内部晶体温度分布的精度；(3)根据滤光器热分析结果对三通道滤光器的结构和温控的设计提出了改进意见,并对各种改进策略进行分析和验证。其中采用对玻璃座恒温的控制方法可以提高控制精度0.037℃～0.016℃,可以满足滤光器的工作要求；(4)分析原有三通道滤光器温控系统存在的问题并提出该进的方法。改进后的三通道滤光器温控系统采用PID控制器,闭环控制滤光器晶体的温度。采集的温度数据还通过串口发送给上位机,上位机软件采用LabVIEW开发,在上位机可以非常友好的实时显示滤光器晶体温度。模拟温控实验表明改进后的滤光器温控系统的控制精度为0.015℃。更多还原

【Abstract】 ABSTRACT:Triple channel birefringent optical filter is the major instruments in research of solar physics. The refractive index of crystal material in optical filter is sensitive to temperature, so the optical filter has to work in the 315.15K constant temperature environment.The temperature control accuracy of the most thick ice spar-grade should be under 0.01K. The temperature difference of internal crystal in triple-channel optical filter must be less than 0.15K.In this thesis, the thermal of the triple-channel optical filter is analyzed in ANSYS. The results of thermal analysis provide guidance for the structural and temperature control design of optical filter. And the core circuit of the temperature control system is designed based on ARM7 MCU. The main research results of this thesis are as follows:1. The model of triple-channel optical filter in ANSYS is simplified and verified, which is helpful to create full and reasonable element model of thriple-channel optical filter in ANSYS.2. The effection of environmental conditions on temperature distribution of crystal is analysed. The temperature control system has to adjust heating power to different environmental conditions. And heating power influences the precision of temperature distribution on crystal.3. The results of thermal analysis provide guidance for thermal structural and temperature control system design of the triple-channel optical filter. The improvement strategies are analysed and verified. Among them, the strategy of thermostatic insulation glass can improves the temperature accuracy by 0.037K to 0.16K, which can satify optical filter work condition.4. The problems in current temperature control system and solution are analyzed. The core circuit of improved PID temperature control system is implemented based on ARM7. And the temperature information is sent to PC by UART. And the front panel of LabVIEW software in PC can display filters temperature in real-time. Experiments shows that the precision of improved temperature control system is 0.015K.更多还原