离子推力器栅极组件热态间距测量系统研制  

Development of hot gap measurement system for the ion thruster optics

作　　者：袁杰红[1] 梁栋 周仕明 肖势杰 李兴坤 杨俊泰 YUAN Jiehong;LIANG Dong;ZHOU Shiming;XIAO Shijie;LI Xingkun;YANG Juntai(College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China;National Key Laboratory of Vacuum and Cryogenic Technology on Physics,Lanzhou Institute of Physics,Lanzhou 730030,China)

机构地区：[1]国防科技大学空天科学学院,湖南长沙410073 [2]兰州空间物理技术研究所真空低温技术与物理国家级重点实验室,甘肃兰州730030

出　　处：《国防科技大学学报》2020年第1期51-58,共8页Journal of National University of Defense Technology

基　　金：真空低温技术与物理国家级重点实验室开放基金资助项目(ZWK1702)

摘　　要：为了完成LIPS-300离子推力器三栅极组件在真空、高温环境中微小热态间距的高精度测量,设计了一套使用远距显微镜的非接触摄像测量系统。基于拍摄的图像,运用交互式分区方法获得多个圆形合作标志稳定、清晰的边缘,利用合作标志和标定片完成图像放大系数标定、图像畸变校正以及栅极热态间距亚像素级测量。精度验证实验表明,本系统在非加热情况下测量精度优于6μm,在加热情况下测量精度优于12μm。大气环境下的加热实验结果显示屏栅和加速栅温度差越大,栅极热态间距的减小量越大,当温差最大为150℃时热态间距减少量达到最大,即420μm。同时,由于安装环的热变形影响,栅极在热稳态时热变形量下降、在冷却期时产生负位移现象,测量结果与国外同类实验趋势一致。系统满足栅极组件热态间距测量的需求。In order to complete the high-precision measurement of the LIPS-300 ion thruster hot gap in the vacuum,high-temperature environment,a non-contact videometrics system using a telemicroscope was designed. Based on the captured image,the interactive partitioning edge detection method was used to obtain stable and clear edges of multiple circular cooperation logos,meanwhile the magnification factor calibration,image distortion correction,horizontal plane correction and hot gap subpixel level deformation detection were performed with cooperation logos. The accuracy verification experiments show that the measurement accuracy of the system is better than 6 μm under non-heating conditions,and the measurement accuracy is better than 12 μm under heating conditions. Experimental results show that the greater the temperature difference between the screen and the accelerator grid,the larger the reduction of the grid hot gap,when the screen grid and the accelerator grid temperature difference is at most 150 ℃,and the hot gap reduction reaches a maximum of 420 μm. At the same time,due to the thermal deformation of the mounting ring,the thermal deformation of the grid decreases during thermal steady state,and the negative displacement occurs during the cooling period. The results of grid thermal deformation measurements are consistent with the trend of similar previous experiments,and the system meets the requirements of ion thruster hot gap measurement.

关 键 词：离子推力器 栅极热态间距 摄像测量学 远距显微镜 亚像素定位 

分 类 号：TP247[自动化与计算机技术—检测技术与自动化装置] TP317.4[自动化与计算机技术—控制科学与工程]