设计了一种镜头分离式CCD液氮杜瓦,主要应用于天文望远镜成像系统中,利用相变制冷为CCD探测器提供适合的工作温度和可靠的环境保护的支撑和封装。文章通过对液氮存储器到CCD探测器装载平台之间的热桥进行理论计算,并与实测值进行比较,得出修正值,应用到结构调整中,生产出了满足需求的产品。 A kind of CCD liquid nitrogen Dewar was designed, which is mainly used in the imaging system of astronomical telescope. It uses phase change refrigeration to provide support and package for CCD detector with suitable working temperature and reliable environmental protection. The article calculates the thermal bridge between the liquid nitrogen storage and the CCD detector loading platform and compares it with the measured value to get the correction value, which is applied to the structural adjustment to produce the product which meets the demand.