太阳光谱辐照度仪的自定标实现

Self-calibration of solar spectral irradiance-meter

为实现卫星遥感器地面定标中大气辐射特性的高精度观测,研制了高精度、光谱式太阳辐照度仪。结合野外工作中仪器存在的衰减与损耗,设计了适合于长期外场应用的自定标系统。自定标系统设计采用双通道镜像的方案,利用基于球面镜的耦合镜实现光路的切换,实现单色光进入棱镜。结合光路的设计方案,采用步进电机带动反射镜切换光路,同时利用单片探测器测量入射/出射光通量采集,通过比值计算实现单波长下棱镜透过率的测量。在实验室内外进行了自定标的性能测试,室内自定标结果的重复性误差为2.5%,室内外透过率对比的相对偏差小于2%,证明自定标系统可以用于户外仪器的监测与校正。

For high accuracy observation of atmosphere radiation characteristics about the ground calibration of satellite remote sensor, a solar irradiance spectra-radiometer that can realize high accuracy measurement has been developed. Considering the attenuation and loss of the instrument when worked in the field, the self-calibration system that suited to long-term application was designed. The enantiomorphous design of double-channel was adopted in the self-calibration system, and the coupling mirror based on spherical lens was designed to switch light direction, so the monochromatic light entering the prism was achieved. Based on the design of light path, the reflector which was driven by the stepping motor was designed to switch the optical path, and the flux of incident/emergent light was acquired by the monolithic detector, finally the transmission of the prism was acquired by ratio calculation. The performance of self-calibration system was tested in and out the laboratory, the repeatability error was less than 2.5% indoor and the relative deviation of transmission indoor and outdoor was less than 2 %, the results show that the self-calibration system can be used for monitoring and correction of field equipment. Key words ： attenuation; coupling mirror ; self-calibration; atmosphere radiation characteristics satellite remote sensor