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本辐射计是一种被动扫描式红外仪器,安装在卫星的腰部,借助卫星的自旋扫描地球,从而可探测不同地理位置的地球大气背景的红外辐射。辐射计由两大部分组成:光学系统和电学系统。光学系统将地气红外辐射信号经调制、汇聚及滤光后投射到红外敏感元件上。由红外元件转换为交变电信号。电学系统将此电信号放大处理后输入无线电遥测系统。为了在空间对红外辐射强度进行绝对测量,必须设置参考光源。为了尽量缩小仪器的体积和重量,将调制盘涂成光学黑,兼做参考光源。从地气背景及参考光源来的辐射信号N_(目标)及N_(参考)经斩波器交替进入光学系统,红外元件输出的电信号与N_(目标)和N_(参考)之差成比例。
The Radiometer is a passive scanning infrared instrument mounted on the waist of a satellite that uses the satellite’s spin to scan the Earth to detect the infrared radiation of Earth’s atmosphere in different geographical locations. Radiometer consists of two parts: the optical system and electrical system. The optical system modulates the ground gas infrared radiation signal, converges and filters the light and projects it onto the infrared sensor. By the infrared components into alternating electrical signals. The electrical system amplifies this electrical signal and inputs it to the radio telemetry system. In order to measure the intensity of infrared radiation in space, a reference light source must be set. In order to minimize the size and weight of the instrument, the modulation plate is coated with optical black and serves as a reference light source. Radiation signals N_ (target) and N_ (reference) from the geo-gas background and the reference light source alternately enter the optical system through a chopper, and the electrical signal output by the infrared element is proportional to the difference between N_ (target) and N_ (reference).