2002年3月至9月间,用3台太阳辐照度绝对辐射计(SIAR)组装的太阳常数监测器在神舟3号飞船轨道舱上测量了太阳辐照度.改进了SIAR辐射计的锥腔结构,把电加热丝埋在薄锥腔壁中间,提高了绝对精度.采用了用宽视场辐射计飞船在轨运动中太阳扫过其视场期间进行测量的方法,测量值与美国EOS上ACRIM III测量数据的最大偏差在0.2％以内. Solar irradiance was measured on a Shenzhou 3 spacecraft orbiting module using a solar constant monitor assembled with three solar irradiance absolute radiometers (SIARs) between March and September 2002. The cone of the SIAR radiometers was improved Cavity structure, the electric heating wire buried in the middle of the thin cone cavity to improve the absolute accuracy.With a wide field of view radiometer spacecraft in orbit during the sun swept through its field of view during the measurement method, the measured value and the United States EOS The maximum deviation of ACRIM III measurement data is within 0.2%.