A Hot Calibration Load of Measuring and Controlling Temperature

A hot calibration load whose temperature is measured and controlled is described, and the measurement method of the microwave absorber reflectivity is also mentioned. In the end, two mathematical models are provided. The numerical results show obviously that the brightness temperature is the function of the angle of view, the contribution of the insulation layer can not be neglected.     

高精度光谱辐射标准探测器的温度特性研究

高精度辐射定标技术是现代空间遥感的主要支撑技术之一。基于滤光片辐射计的新型光辐射标准探测器在野外、机载和星上高精度辐射定标中具有广阔的应用前景。温度特性是工程应用中影响标准探测器绝对精度和稳定性的一项关键因素。在20～60℃的宽温度范围内,对基于硅陷阱探测器的滤光片辐射计温度特性进行了系统测试和定量研究,在所获取的完备的实验数据基础上设计并研制了一套精密温控系统。实验结果显示在加入精密温控后,滤光片辐射计的温度系数降低了约一个数量级,从而有利于在不同温度工作平台上保持标准探测器的高精度。     

Models for the Brightness Temperature of Extended Targets at MM Wave Frequency

An experimental method of establishing formulas for calculating brightness temperature of extended targets at mm wave frequency is introduced in this paper. The formulas are obtained through the statistic process of a large amount of measured data. The formulas for concrete road, asphalt road, and crushed stone are presented, which are established by this method.