The Fengyun series 4 (FY-4) Geostationary Interferometric Infrared Sounder (GIIRS) is the first interferometric infrared sounder operating in geostationary orbit internationally, for vertical air soundings of temperature and humidity. This paper describes the long-life Stirling cryocooler operating at 60 K in GIIRS. The cryocooler’s performance at room temperature, mounting status on the GIIRS, performance with and without phase control and on-orbit performance for 2 years are described. Until May 31, 2019, the cooler had more than 20,000 h of continuous running time with no indication of a change in performance. The undegraded performance provided by the cryocooler has enabled the GIIRS to fulfill its mission.

风云系列4（FY-4）对地静止干涉红外测深仪（GIIRS）是国际上第一个在对地静止轨道运行的干涉红外测深仪，用于垂直温度和湿度的空气探测。本文介绍了在GIIRS中以60 K运行的长寿命斯特林低温冷却器。描述了低温制冷器在室温下的性能，在GIIRS上的安装状态，有无相位控制的性能以及2年的在轨性能。直到2019年5月31日，冷却器的连续运行时间超过20,000小时，并且没有性能变化的迹象。低温冷却器提供的出色性能使GIIRS能够完成其任务。