摘要
为了对风云三号C星太阳辐射监测仪的太阳辐照度绝对辐射计的在轨性能进行定量表征,进行了正样产品的太阳辐照度绝对辐射计真空环境中腔温响应特性的测量工作。相同加热功率下的辐射计腔温瞬态响应表明,由于缺少空气对流这一传热途径,使得真空环境中辐射计腔温趋于平衡的时间常数延长为29.23 s,所以标定主腔温升单位输出码值对应的加热功率时,采样时间应该设定为5 min。真空环境中主腔温升的输出码值与所加加热功率之间经测量为良好的线性关系,稳定性良好,保证了绝对辐射计在轨的测量性能。不同采样时间的辐照度测量结果表明,尽管测量过程中主腔温度变化较小,但也需要足够长的采样时间才能使腔温达到平衡值。因此FY-3C星太阳辐射监测仪在轨测量时自测试和辐照度测量均应将采样时间设定为5 min。
Cavity temperature response performance of solar irradiance absolute radiometer of Solar Irradiance Monitor on FY-3C satellite flight model was tested in vacuum to characterize its performance in space.Based on the transient response of radiometer cavity temperature in the same heating power condition,the time constant of the cavity was extended to 29.23 s since cross-ventilation was absence in vacuum.Thus the sampling time of calibration of heating power per temperature code should be 5 minutes.The measurement characterization of the radiometer in space is assured by the upstanding and steady linear relationship of temperature code and heating power.It is indicated by the irradiance measurement results with different sampling time that the sampling time of irradiance measurement need to be long enough though the variety of the main cavity temperature is small during continuous measuring period.Therefore the sampling time of self test and irradiance measurement should be 5 minutes in space.
出处
《电子测量与仪器学报》
CSCD
2013年第8期709-714,共6页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(41227003)资助项目
关键词
太阳辐照度
绝对辐射计
温度响应
时间常数
solar irradiance
absolute radiometer
temperature response
time constant
