多角度偏振成像仪高精度辐射定标方法
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摘要
开展高精度辐射定标方法研究,对于多角度偏振成像仪实现大气气溶胶粒子分布和微观物理特性探测反演的科学应用至关重要。采用傅里叶级数的分析方法,建立了全视场起偏度的测量模型,消除了参考光源偏振方位角绝对位置引入的测量误差,实现了光学系统偏振特性的准确测量。结合多角度偏振成像仪的辐射与偏振定标模型,开展了光学系统偏振特性的校正方法研究,实现偏振特性引起辐射定标不确定度由8%下降至2.2%以内。利用高精度二维转动平台和大口径积分球辐射源,采用分视场测量方法,校正像元响应非一致性,实现相对辐射校正精度优于0.5%。采用基于标准灯漫反射板的辐亮度量值传递链路,经过各影响因素的分析评测,所有波段辐射定标精度均优于5%。
Radiometric calibration of the directional polarization camera(DPC) with high-precision is very important for quantitative scientific application of acquiring an accurate description of aerosol distributions and microphysical properties. Using Fourier series analysis method, a polarization rate measurement model is established to eliminate the measurement error introduced by the absolute direction in the angle of linear polarization of the reference light source,so that the polarization property is measured with high accuracy. Combining radiometric and polarimetric calibration model of DPC, radiometric calibration uncertainty caused by polarization property decreased from 8.8% to 2.2% after correction. Using an integrating sphere light source with large aperture and high-precision two-dimensional turntable platform, adopting sectional viewing field measurement method, the entire pixels response non-uniformity is measured and corrected, and the precision of relative radiometric calibration coefficient is better than 0.5%. To transfer the spectral radiance value, the standard lamp and diffuse reflection reference board system is introduced. According to analysis and evaluation of various factors, radiometric calibration accuracy of the entire waveband is better than 5%.
Radiometric calibration of the directional polarization camera(DPC) with high-precision is very important for quantitative scientific application of acquiring an accurate description of aerosol distributions and microphysical properties. Using Fourier series analysis method, a polarization rate measurement model is established to eliminate the measurement error introduced by the absolute direction in the angle of linear polarization of the reference light source,so that the polarization property is measured with high accuracy. Combining radiometric and polarimetric calibration model of DPC, radiometric calibration uncertainty caused by polarization property decreased from 8.8% to 2.2% after correction. Using an integrating sphere light source with large aperture and high-precision two-dimensional turntable platform, adopting sectional viewing field measurement method, the entire pixels response non-uniformity is measured and corrected, and the precision of relative radiometric calibration coefficient is better than 0.5%. To transfer the spectral radiance value, the standard lamp and diffuse reflection reference board system is introduced. According to analysis and evaluation of various factors, radiometric calibration accuracy of the entire waveband is better than 5%.
引文
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[14] Yuan Yinlin, Xu Jun, Zhai Wenchao, et al. Design and test of a spectrum-tunable integrating spheres reference light source with large exit aperture[J]. Acta Optica Sinica, 2013, 33(7):0712004(in Chinese).袁银麟,徐骏,翟文超,等.大孔径可调光谱积分球参考光源研制和检测[J].光学学报,2013, 33(7):0712004.
[15] Xie Ping, Wu Haoyu, Zheng Xiaobing, et al. Automatic directional radiometric testing system for large aperture integrating spheres[J]. Optics Precision Engineering, 2010, 18(9):1943-1950(in Chinese).谢萍,吴浩宇,郑小兵,等.大口径积分球辐出度分布自动测试系统[J].光学精密工程, 2010,18(9):1943-1950.
[16] Leng Jianhua. Fourier transform[M]. Beijing:Tsinghua University Press, 2004:16-22(in Chinese).冷建华.傅里叶变换[M].北京:清华大学出版社, 2004:16-82.
[2] Bret-Dibat T, Andre Y, Laherrere J M. Preflight calibration of the POLDER instrument[C]//Infrared Spaceborne Remote SensingⅢ. International Society for Optics and Photonics, 1995, 2553:218-232.
[3] Tang Weiping, Hong Jin, Wang Yuanjun, et al. Airborne directional polarization camera and its optical system design[J]. Journal of Atmospheric and Environmental Optics, 2008, 3(3):213-216(in Chinese).汤伟平,洪津,汪元钧,等.航空多角度偏振成像仪及其光学系统设计[J].大气与环境光学学报, 2008, 3(3):213-216.
[4] Frouin R, Deschamps P Y, Rothschild R, et al. MAUVE/SWIPE:An imaging instrument concept with multiangular,-spectral, and-polarized capability for remote sensing of aerosols, ocean color, clouds, and vegetation from space[J]. Proceedings of SPIE, 2006, 6406:64060E.
[5] Ohring G, Tansock J, Emery W, et al. Achieving satellite instrument calibration for climate change(ASIC3)[J].EOS, Transactions American Geophysical Union, 2007, 88(11):1-136.
[6] Deuze J L, Breon F M, Devaux C, et al. Remote sensing of aerosols over land surfaces from POLDER-ADEOS-1polarized measurements[J]. Journal of Geophysical Research, 2001, 106(D5):4913-4926.
[7] Qiao Yanli, Zheng Xiaobing, Wang Xianhua, et al. Whole-process radiometric calibration of optical remote sensors[J]. Journal of Remote Sensing, 2006, 10(5):616-623(in Chinese).乔延利,郑小兵,王先华,等.卫星光学传感器全过程辐射定标[J].遥感学报, 2006, 10(5):616-623.
[8] Zheng Xiaobing. High-accuracy radiometric calibration of satellite optical remote sensors[J]. Spacecraft Recovery&Remote Sensing, 2011, 32(5):36-43(in Chinese).郑小兵.高精度卫星光学遥感器辐射定标技术[J].航天返回与遥感,2011,32(5):36-43.
[9] Chen Ligang, Meng Fangang, Yuan Yinlin, et al. Project of calibration method for polarization camera[J].Journal of Atmospheric and Environmental Optics, 2010, 5(3):227-231(in Chinese).陈立刚,孟凡刚,袁银麟,等.偏振相机的光学定标方案研究[J].大气与环境光学学报,2010, 5(3):227-231.
[10] Chen Ligang, Meng Fangang, Yuan Yinlin, et al. Experimental study for the polarization characteristics of airborne polarization camera[J]. Journal of Optoelectronics Laser, 2011, 22(11):1629-1632(in Chinese).陈立刚,孟凡刚,袁银麟,等.航空偏振相机的光学偏振特性实验研究[J].光电子·激光, 2011,22(11):1629-1632.
[11] Chen Ligang. Polarimetric calibration of the polarization ccd camera with large viewing field[J]. Opto-Electronic Engineering, 2015, 42(2):15-20(in Chinese).陈文刚.大视场偏振CCD相机的偏振特性实验标定[J].光电工程,2015, 42(2):15-20.
[12] Chen Ligang. Study of Laboratory Calibration of the Airborne Polarization CCD Camera with Wide Field of View[D]. Hefei:Doctorial Dissertation of Anhui Institute of Optics and Fine Mechanics, 2008:8-74(in Chinese).陈立刚.宽视场航空偏振成像仪的实验室定标研究[D].合肥:中国科学院安徽光学精密机械研究所博士论文, 2008:8-74.
[13] Qian Honghu, Meng Binghuan, Yuan Yinlin, et al. The full field of view polarization effects measurement and error analysis of non-polaried channels of spaceborne directional polarimetric camera[J]. Acta Physica Sinica,2017, 66(10):100701(in Chinese).钱鸿鹄,孟炳寰,袁银麟,等.星载多角度偏振成像仪非偏通道全视场偏振效应测量及误差分析[J].物理学报,2017,66(10):100701.
[14] Yuan Yinlin, Xu Jun, Zhai Wenchao, et al. Design and test of a spectrum-tunable integrating spheres reference light source with large exit aperture[J]. Acta Optica Sinica, 2013, 33(7):0712004(in Chinese).袁银麟,徐骏,翟文超,等.大孔径可调光谱积分球参考光源研制和检测[J].光学学报,2013, 33(7):0712004.
[15] Xie Ping, Wu Haoyu, Zheng Xiaobing, et al. Automatic directional radiometric testing system for large aperture integrating spheres[J]. Optics Precision Engineering, 2010, 18(9):1943-1950(in Chinese).谢萍,吴浩宇,郑小兵,等.大口径积分球辐出度分布自动测试系统[J].光学精密工程, 2010,18(9):1943-1950.
[16] Leng Jianhua. Fourier transform[M]. Beijing:Tsinghua University Press, 2004:16-22(in Chinese).冷建华.傅里叶变换[M].北京:清华大学出版社, 2004:16-82.