地基大口径红外光电系统的联合辐射定标
发布时间：2019-03-29 19:20
【摘要】：考虑标准红外星定标方法无法测定地基大口径红外光电系统像元级的辐射响应度,进而导致对系统存在的非均匀性现象适应能力差的问题,提出了基于标准红外星与小口径黑体的联合辐射定标方法。该方法以标准红外星为外定标参考源,测定全光路系统的辐射响应度;以小口径黑体为内定标参考源,测定半光路系统像元级的辐射响应度;最后,结合内、外定标结果推算前端光学系统透过率,进而实现系统的全光路像元级辐射响应度定标。开展了自然星红外辐射特性测量实验,并与标准红外星定标方法进行了对比。结果显示:提出方法获得的目标最大反演误差为15.89%,而标准红外星定标方法在最理想情况下获得的最大反演误差为15.92%,表明提出方法的定标精度高于标准红外星定标方法。另外,提出方法能够测定全光路系统像元级的辐射响应度,克服了系统响应非均匀性的影响,进而提高了红外探测器的焦平面利用率,弥补了标准红外星定标方法的应用缺陷。
[Abstract]:Considering that the standard infrared star calibration method can not measure the radiative response of the pixel level of the large aperture infrared photoelectric system on the ground, which leads to the poor adaptability to the non-uniform phenomenon of the system. A combined radiometric calibration method based on standard infrared star and small aperture blackbody is proposed. Using the standard infrared star as the external calibration source, the radiation response of the all-optical path system is measured, and the radiation response of the half-optical system pixel level is determined with the small caliber black body as the internal calibration reference source, and the radiative response of the half-optical system is determined by using the standard infrared star as the external calibration source. Finally, based on the internal and external calibration results, the transmittance of the front-end optical system is calculated, and then the all-optical path pixel-level radiative response calibration of the system is realized. The infrared radiation characteristics of natural stars are measured and compared with the calibration methods of standard infrared stars. The results show that the maximum inversion error of the proposed method is 15.89%, while the maximum inversion error of the standard infrared star calibration method is 15.92% under the optimal conditions. It is shown that the calibration accuracy of the proposed method is higher than that of the standard infrared star calibration method. In addition, the method can measure the radiative response of all-optical system pixel level, overcome the influence of non-uniformity of system response, improve the utilization rate of focal plane of infrared detector, and make up for the application defect of standard infrared star calibration method.
【作者单位】： 中国科学院长春光学精密机械与物理研究所;
【基金】：国家863高技术研究发展计划资助项目(No.2015AAXXX1009)
【分类号】：TN216
[Abstract]:Considering that the standard infrared star calibration method can not measure the radiative response of the pixel level of the large aperture infrared photoelectric system on the ground, which leads to the poor adaptability to the non-uniform phenomenon of the system. A combined radiometric calibration method based on standard infrared star and small aperture blackbody is proposed. Using the standard infrared star as the external calibration source, the radiation response of the all-optical path system is measured, and the radiation response of the half-optical system pixel level is determined with the small caliber black body as the internal calibration reference source, and the radiative response of the half-optical system is determined by using the standard infrared star as the external calibration source. Finally, based on the internal and external calibration results, the transmittance of the front-end optical system is calculated, and then the all-optical path pixel-level radiative response calibration of the system is realized. The infrared radiation characteristics of natural stars are measured and compared with the calibration methods of standard infrared stars. The results show that the maximum inversion error of the proposed method is 15.89%, while the maximum inversion error of the standard infrared star calibration method is 15.92% under the optimal conditions. It is shown that the calibration accuracy of the proposed method is higher than that of the standard infrared star calibration method. In addition, the method can measure the radiative response of all-optical system pixel level, overcome the influence of non-uniformity of system response, improve the utilization rate of focal plane of infrared detector, and make up for the application defect of standard infrared star calibration method.
【作者单位】： 中国科学院长春光学精密机械与物理研究所;
【基金】：国家863高技术研究发展计划资助项目(No.2015AAXXX1009)
【分类号】：TN216
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