2.5 m大视场高分辨率望远镜消光筒温度控制  

Temperature control of extinction tube for the 2.5-meter large-field and high-resolution telescope

作　　者：潘聪 叶宇[1,2] 顾伯忠[1,2] 帅雨林 Pan Cong;Ye Yu;Gu Bozhong;Shuai Yulin(Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China;CAS Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Nanjing 210042,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院南京天文光学技术研究所,江苏南京210042 [2]中国科学院天文光学技术重点实验室(南京天文光学技术研究所),江苏南京210042 [3]中国科学院大学,北京100049

出　　处：《红外与激光工程》2023年第9期175-182,共8页Infrared and Laser Engineering

摘　　要：2.5 m大视场高分辨率望远镜消光筒会接收来自主焦点处的热辐射,加热镜筒内空气,产生随机湍流,降低视宁度,影响望远镜成像质量。为解决这一问题,满足2.5 m望远镜温控指标要求,设计Smith自抗扰控制器(ADRC-Smith),利用自抗扰控制结合Smith预估算法实现对消光筒壁面温度的精确控制。首先,建立消光筒温控系统模型,给出ADRC-Smith控制器的结构和调参方法;其次,对消光筒温控系统进行仿真,分析控制器的可行性;最后,搭建消光筒温控系统,实验验证控制器的实用性。实验结果表明,ADRC-Smith控制器可以将消光筒壁面温度控制在环境温度2℃内,对应的响应时间和稳定时间分别约为59 s和173 s,跟随误差约为0.14℃。研究表明,ADRC-Smith控制器可以提高2.5 m大视场高分辨率望远镜消光筒温控系统的性能。Objective The extinction tube of the 2.5-meter large-field and high-resolution telescope receives thermal radiation from the main focal point,heats the air in the lens barrel,generates random turbulence,reduces the astronomical seeing,and affects the imaging quality of the telescope.In order to solve this problem and meet the temperature control index requirements of temperature control,the Smith-Active Disturbance Rejection Controller(ADRC-Smith)is designed.Methods The designed ADRC-Smith controller uses the automatic disturbance rejection control combined with the Smith predictor method,which adds a Smith estimation module to the ESO signal input of the linear ADRC,uses the Smith predictor to cancel the time delay term in the closed-loop characteristic equation,and uses the automatic disturbance rejection controller to improve the response speed and robustness of the temperature control system to achieve accurate control of the extinction cylinder wall temperature.Firstly,the mechanism modeling and model parameter identification of the extinction cylinder temperature control system are carried out(Fig.3),the model of the extinction cylinder temperature control system is established,and the structure(Fig.5)as well as the parameter adjustment method of the ADRC-Smith controller are given.Secondly,according to the system model,the temperature control system of the matting cylinder is simulated when the model is accurate and the model is out of alignment to analyze the feasibility of the controller(Fig.6-7).Finally,the temperature control system of the matting cylinder at the main focus is set up for carrying out stability and reliability test to verify the practicality of the controller(Fig.1-2).Results and Discussions The experiment results of the stability test show that the ADRC-Smith controller can quickly track the ambient temperature,control the temperature of the extinction cylinder wall within 2℃ of the ambient temperature,and the corresponding response time and settling time are about 59 s and 173 s res

关 键 词：2.5 m大视场高分辨率望远镜 消光筒 温度控制 自抗扰控制器 Smith预估器 

分 类 号：TH751[机械工程—仪器科学与技术]