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研究了航空多角度偏振辐射计的辐射定标方法,以消除其自身引入的偏振效应,提高偏振辐射计的测量精度。首先,根据引入仪器偏振效应的主要因素推导了含定标系数的仪器探测方程,由仪器在0°和90°两个状态下对同一信号的探测方程求解了定标系数表达式,并设计了仪器分别处于两个状态下获取信号、求解定标系数的定标方法。最后,分别针对非偏振光源和完全线偏振光源的测试数据求解了所有的定标系数,使用可调偏振度光源验证了偏振定标结果。结果显示,该仪器偏振测量精度不低于0.5%,满足仪器精度指标要求。
The radiation calibration method of multi-angle polarimeter is studied in order to eliminate its own polarization effect and improve the measurement accuracy of the polarimeter. First of all, according to the main factor of introducing polarization effect of instrument, the instrument detection equation with calibration coefficient was deduced. The expression of calibration coefficient was solved by the instrument under two states of 0 ° and 90 °, and the calibration coefficient was designed Instrument were in two states to obtain the signal, calibration method for calibration. Finally, all the calibration coefficients were solved for the test data of the unpolarized light source and the completely linear polarized light source, respectively. The results of the polarization calibration were verified by using the adjustable polarization light source. The results show that the instrument polarization measurement accuracy of not less than 0.5%, to meet the requirements of the instrument accuracy index.