Optical design for multichannel scanning radiometer onboard FY-2 goestationary meteorological satellite

China's first geostationary meteorological satellite FY-2 was successfully launched on June 10th 1997. The main effective payload on-board the satellite - the multi-channel scanning radiometer - was developed by the Shanghai Institute of Technical Physics, Chinese Academy of Sciences. The scanning radiometer can acquire the earth images from three channels of visible, IR and water vapor simultaneously. From the images obtained one can see that the images are very clear with enough signal to noise ratio. This paper takes a brief look back at the design and development of the optical system of the scanning radiometer.