太阳辐射计视场角定标方法对比研究
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摘要
太阳辐射计是观测大气气溶胶重要的地基遥感设备,其定标是获取高精度气溶胶产品的前提条件.视场角(field of view,FOV)是太阳辐射计的重要参数,也是传递定标的关键参数.基于SONET观测网2016年定标实验,对传递定标方法(单次传递及历史传递平均结果)和矩阵扫描法获得的仪器FOV进行对比分析,结果表明:单次传递、历史传递平均和激光矩阵扫描结果与仪器的FOV设计值平均相对误差在2%～3%之内,而三种方法获得的FOV最大相对误差为1.59%,满足FOV的精度要求。误差分析表明,传递定标法误差主要来自积分球辐亮度定标系数,而矩阵扫描法的误差主要由激光面光源引起。但三种方法各有优劣,可以相互验证、相互补充,以获得更加准确的仪器FOV参数。
Sun radiometer is an important ground-based remote sensing device to observe atmospheric aerosol,and the calibration is a prerequisite to obtain the high accuracy of aerosol products. Field of view(FOV) is an important parameter of sun radiometer, and it is also a key parameter for the transfer calibration. Based on the calibration experiment of Sun-sky radiometer observation network(SONET) in 2016, the FOV of instruments obtained by transfer method(single transfer and the average result of historical transfer) and matrix scanning method were analyzed, and the result showed that the average relative error of the results obtained by single transfer, the average of historical transfer and the matrix scanning is within 2%～3%, and the max average relative error is 1.59% compared with themselves. The three methods can satisfy the requirements of the precision of FOV. The error analysis shows that the error of transfer calibration method mainly comes from integrating sphere radiance calibration coefficient, and the error of matrix scanning method is mainly caused by the laser beam. However, these three methods all have their own advantages and disadvantages. They can verify and complement each other, in order to obtain more accurate FOV of the instrument.
Sun radiometer is an important ground-based remote sensing device to observe atmospheric aerosol,and the calibration is a prerequisite to obtain the high accuracy of aerosol products. Field of view(FOV) is an important parameter of sun radiometer, and it is also a key parameter for the transfer calibration. Based on the calibration experiment of Sun-sky radiometer observation network(SONET) in 2016, the FOV of instruments obtained by transfer method(single transfer and the average result of historical transfer) and matrix scanning method were analyzed, and the result showed that the average relative error of the results obtained by single transfer, the average of historical transfer and the matrix scanning is within 2%～3%, and the max average relative error is 1.59% compared with themselves. The three methods can satisfy the requirements of the precision of FOV. The error analysis shows that the error of transfer calibration method mainly comes from integrating sphere radiance calibration coefficient, and the error of matrix scanning method is mainly caused by the laser beam. However, these three methods all have their own advantages and disadvantages. They can verify and complement each other, in order to obtain more accurate FOV of the instrument.
引文
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[17]Li Zhengqiang,Li Donghui,Li Kaitao,et al.Sunsky radiometer observation network with the extension of multi-wavelength polarization measurements[J].Journal of Remote Sensing,2015,19(3):495-519(in Chinese).李正强,李东辉,李凯涛,等.扩展多波长偏振测量的太阳一天空辐射计观测网[J].遥感学报,2015,19(3):495-519.
[18]Dubovik O,King M D.A flexible inversion algorithm for retrieval of aerosol optical properties from Sun and sky radiance measurements[J].Journal of Geophysical Research:Atmospheres,2000,105(D16):20673-20696.
[19]Li K,Li Z,Li D,et al.Transfer method to calibrate the normalized radiance for a CE318Sun/sky radiometer[J].Chinese Optics Letters,2015,13(4):16-20.
[2]Li Z,Blarel L,Podvin T,et al.Transferring the calibration of direct solar irradiance to diffuse-sky radiance measurements for CIMEL Sun-sky radiometers[J].Applied Optics,2008,47(10):1368-1377.
[3]Zhang Long,Li Baosheng,Li Kaitao,et al.Analysis of comparison-calibration methods based on MICROTOPS II 5-channels sun photometer[J].Remote Sensing Information,2013,28(5):32-36(in Chinese).张龙,李保生,李凯涛,等.MICROTOPS II型太阳光度计对比定标分析[J].遥感信息,2013,28(5):32-36.
[4]Harrison L,Michalsky J,Berndt J.Automated multifilter rotating shadow-band radiometer:an instrument for optical depth and radiation mear surements[J].Applied Optics,1994,33(22):5118-5125.
[5]Cerqueira J G,Fernandez J H,Hoelzemann J J,et al.Langley method applied in study of aerosol optical depth in the Brazilian semiarid region using 500,670 and 870 nm bands for sun photometer calibration[J].Advances in Space Research,2014,54(8):1530-1543.
[6]Hu Xiuqing,Zhang Yuxiang,Huang Yifen,et al.Total water vapor of atmospheric column retrieved by 940 nm channel of sun radiometer[J].Meteorological Science and Technology,2001,29(3):12-17(in Chinese).胡秀清,张玉香,黄意玢,等.利用太阳辐射计940nm通道反演大气柱水汽总量[J].气象科技,2001,29(3):12-17.
[7]Yang Zhifeng,Zhang Xiaoye,Che Huizheng,et al.An introductory study on the calibration of CE318 sunphotometer[J].Journal of Applied Meteorological Science,2008,19(3):297-306(in Chinese).杨志峰,张小曳,车慧正,等.CE318型太阳光度计标定方法初探[J].应用气象学报,2008,19(3):297-306.
[8]Gao Ling,Zhao Chunlei,Li Chengcai,et al.Calibration and error analysis for multi-wavelength sun-photometer observations[J].Acta Scientiarum Naturalium Universitatis Pekinensis,2011,47(6):1017-1024(in Chinese).高玲,赵春雷,李成才,等.多波段光度计定标及误差分析[J].北京大学学报自然科学版,2011,47(6):1017-1024.
[9]Holben B N,Eck T F,Slutsker I,et al.AERONET-A federated instrument network and data archive for aerosol characterization[J].Remote Sensing of Environment,1998,66(1):1-16.
[10]Che H,Zhang X,Chen H,et al.Instrument calibration and aerosol optical depth validation of the China Aerosol Remote Sensing Network[J].Journal of Geophysical Research Atmospheres,2009,114(D3):D03206.
[11]Xu Qiuyun,Zheng Xiaobing,Zhang Wei,et al.Advanced calibration method for Sun Radiometers[J].Acta Optica Sinica,2010(5):1337-1342(in Chinese).徐秋云,郑小兵,张伟,等.太阳辐射计先进定标方法研究[J].光学学报,2010(5):1337-1342.
[12]Nakajima T,Tonna G,Rao R,et al.Use of sky brightness measurements from ground for remote sensing of particulate polydispersions[J].Applied Optics,1996,35(15):2672-2686.
[13]Boi P,Tonna G,Dalu G,et al.Calibration and data elaboration procedure for sky irradiance measurements[J].Applied Optics,1999,38(6):896-907.
[14]Torres B,Toledano C,Berjón A,et al.Mear surements on pointing error and field of view of Cimel-318 sun photometers in the scope of AERONET-Europe[J].Atmospheric Measurement Techniques,2013,6(8):3013-3057.
[15]Li Kaitao.Study on The Transfer Calibration Methods of Polarized Sun-sky Radiometer[D].Beijing:Doctorial Disseration of University of Chinese Academy of Sciences,2015(in Chinese).李凯涛.太阳-天空偏振辐射计传递定标方法研究[D].北京:中国科学院大学博士论文,2015.
[16]Li Wei,Li Zhengqiang,Yang Benyong,et al.Approach to measure field of view of sun-photometerusing laser as light source[J].Journal of Atmospheric and Environmental Optics,2015,10(4):315-322(in Chinese).李伟,李正强,杨本永,等.基于激光光源的太阳辐射计视场角测量方法[J].大气与环境光学学报,2015,10(4):315-322.
[17]Li Zhengqiang,Li Donghui,Li Kaitao,et al.Sunsky radiometer observation network with the extension of multi-wavelength polarization measurements[J].Journal of Remote Sensing,2015,19(3):495-519(in Chinese).李正强,李东辉,李凯涛,等.扩展多波长偏振测量的太阳一天空辐射计观测网[J].遥感学报,2015,19(3):495-519.
[18]Dubovik O,King M D.A flexible inversion algorithm for retrieval of aerosol optical properties from Sun and sky radiance measurements[J].Journal of Geophysical Research:Atmospheres,2000,105(D16):20673-20696.
[19]Li K,Li Z,Li D,et al.Transfer method to calibrate the normalized radiance for a CE318Sun/sky radiometer[J].Chinese Optics Letters,2015,13(4):16-20.
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