FY-2C卫星太阳X射线探测器性能定标

通过具体的实验对FY-2C太阳X射线探测器进行了详细的定标．太阳X射线探测器的传感器采用充Ar气的正比计数器．主要探测能量大于4 keV的太阳X射线流量．在坪特性、效率、正比性、能道划分、能量分辨率和时间分辨率等6个方面详细介绍了定标的方法及结果．定标结果表明, FY-2C卫星的太阳X射线探测器在各个方面都具有很好的性能．最后对FY-2C的在轨探测数据与GOES卫星进行了比较．GOES卫星的太阳X射线传感器采用电离室．FY-2C的探测结果与GOES的探测结果非常吻合．结果表明, FY-2C太阳X射线探测器可以很好地监测太阳X射线的流量变化,为空间环境监测提供有效的服务．

Calibration Results of Solar X-ray Detector Aboard on FY-2C

The calibrating results of solar X-ray detector aboard on FY-2C are presented in this paper. The transducer of solar X-ray detector is proportional counter. The gas in the transducer is Ar. The solar X-ray detector can monitor the sun's X-ray flux above 4keV in ten channels. The methods and results of experiments for calibrating are presented in detail. The radiation source used in these experiments are 241Am and 55Fe. The calibrating results are listed in six aspects: characteristics of plateau, efficiency, proportional characteristics, determining of energetic channels, energy resolution and time resolution. The plateau length is about 300 V. The plateau slope is less than 5%/100V. The working voltage range of the detector is 1600-1900V. The efficiency curve is calculated theoretically, and the material of the detector is taken into account. The experiments results show that the detector has good proportional characteristic. The time resolution of solar X-ray detector is 8.2 s. The solar X-ray detector aboard on GOES adopted ionization chamber, that is different from FY-2C. The detected results of solar X-ray detector aboard on FY-2C are compared with those of GOES. They fit well. The results show that the solar X-ray detector aboard on FY-2C works well to monitor the X-ray flux of the Sun and contribute much to the space environment monitoring.