利用积分球实现三波段照相机的辐射定标研究

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

根据使用环境和所拍摄物体的不同,利用紫外、可见、近红外滤光片实现成像型CCD相机在350～380 nm,380～760 nm,760～1000 nm不同波段的成像,分别测定了滤光片的光谱透射率.利用积分球均匀光源实现3个波段的光谱辐亮度定标,建立输入辐亮度和探测器输出图像灰度均值间的关系,为照相机适应不同波段清晰成像提供适当曝光参数选择.

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.