采用低温面源黑体实现红外系统宽动态范围定标

发布时间：2018-12-13 01:20

【摘要】：针对大口径地基红外辐射测量系统在辐射定标时存在定标时间长、成本高和设备机动性差等缺点,提出一种仅采用低温面源黑体实现红外系统宽动态范围定标的方法.首先对红外系统中的衰减片进行标校,测量其实际透过率并计算其辐射量;然后采用低温面源黑体在两个积分时间下分别进行辐射定标,根据定标结果解算系统响应率、杂散辐射和探测器自身偏置;结合标校获得的衰减片特性对低温定标结果进行外推,即可获得宽动态范围定标结果.为验证该定标方法有效性,分别采用该方法和通用的高温黑体加大口径平行光管定标法,对Φ600mm红外系统进行宽动态范围辐射定标实验.实验结果表明:本文方法的宽动态范围定标误差小于10.25%,能够满足该系统的辐射定标精度要求.该方法只需要一个低温黑体即可实现红外系统的外场宽动态范围辐射定标,操作简单、实时性强,具有一定的应用价值.
[Abstract]:Aiming at the shortcomings of large caliber ground-based infrared radiation measurement system such as long calibration time, high cost and poor mobility of equipment, a method of infrared system wide dynamic range calibration using only low-temperature non-point source blackbody is proposed. First, the attenuation slices in the infrared system are calibrated, the actual transmittance is measured and the radiation amount is calculated. Then, the low-temperature non-point source blackbody is used to calibrate the radiation at two integral times, according to the calibration results, the system response rate, stray radiation and detector itself bias are calculated. The calibration results at low temperature can be obtained by extrapolating the calibration results based on the characteristics of the attenuates obtained by calibration. In order to verify the validity of the calibration method, the wide dynamic range radiometric calibration experiments of 桅 600mm infrared system were carried out by using this method and the universal high-temperature blackbody and parallel optical tube calibration method. The experimental results show that the calibration error of this method is less than 10.25, which can meet the requirement of radiometric calibration accuracy of the system. This method only needs a low temperature blackbody to realize the external field wide dynamic range radiometric calibration of the infrared system, which is simple, real-time and has certain application value.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家自然科学基金(No.51275504)资助~~
【分类号】：TN219

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