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The study of radiance calibration of three-waveband camera using integrating sphere

LU Zi-feng1,2,3,SUN Qiang1,WANG Jian1,DONG Ke-yan1,LU Zhen-wu1,LIU Yi-chun3(1.State Key Lab.of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China; 2.Graduate University of Chinese Academy of Sciences,Beijing 100039,China; 3.School of Physics,Northeast Normal University,Changchun 130024,China)  
With a three-waveband CCD sharing one optical system,a camera which can image in ultraviolet、visible and near infrared region is realized.The filter transmissivities whose waveband respectively in 350~380 nm,380~760 nm and 760~1 000 nm spectral range are obtained.Grey levels of the image as linear functions of the radiance of the integrating sphere for exposure time changed from 0.125 ms to 8 ms in three wavebands are studied in order to offer relevant exposure time for different waveband.
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