【摘要】 星上定标系统是有效监测遥感器辐射响应性能的重要技术构成,成像光谱仪技术的发展对星上定标系统提出了更高的要求,包括系统小型轻量化及稳定性等技术难题。提出一种较完整的技术方案,以内置卤钨灯为光源,用小型化的积分球为匀光体,采用色温校正技术调节其光谱输出,内置安装标准辐射计监视系统的稳定性。针对积分球系统定标用的光源——卤钨灯对定标精度的影响,研制了一种控制卤钨灯发光强度稳定性的稳流电源。介绍了具有软启动特性的标准灯稳流驱动电源的工作原理及应用电路,并对稳流源电路进行了测试,通过改变三级管增益的方法调整软启动时间,得到电流稳定性误差为0.043%。并对卤钨灯的发光强度进行定量化测量,设计了一种从光电流转换为频率输出的高性能转换电路。测试系统输出频率的稳定性为0.645%。此积分球系统已成功应用于某型号成像光谱仪的星上定标。更多还原

【Abstract】 On-board calibration system is an important technical component for effectively monitoring the performance of radiometric response of remote sensors.With the development of hyper spectral technique,more advanced on-board calibration system and more high performance index are required,which include challenging problems such as system miniaturization,lightweight and stability.A complet e technical solutions to above problems are proposed in this paper,which included halogen lamp as the light source,a miniaturization integrating sphere used as uniform body,color temperature correction technique applied for improving the spectral distribution and a standard radiometer fixed interiorly for monitoring the stability of the system.In order to improve the accuracy of on-board calibration,a kind of stabilized power supply for the tungsten-halogen lamps are developed.The operating principle and current stabilized circuit with the soft start characteristic are introduced.Tested steady flow circuit source,the current′s stability can be up to 0.043% by changing third-level tube′s plus to adjust the time of soft start,computing the value of the current,and measured the luminous intensity.A kind of high-performance conversion circuit which converted a photocurrent to frequency are designed,the frequency stability of system is 0.645%.The integrating sphere has been successfully applied to a type of satellite imaging pectrometer.更多还原