Development and Radiance Calibration of Three-Waveband Camera

An imaging system with three-waveband sharing one lens and an area CCD was developed. By rotating different filters into the beam path, the required waveband was selected. The optical system which can image in ultraviolet, visible and near infrared region was designed and the signal collecting system was integrated. The optical design and system integration have some advantages such as low cost, small size and light in weight. To obtain a high imaging quality, the radiation calibration is carried out in order to establish the relation between the average grey level of output image and the input radiance from the integrating sphere. According to the calibration data in experiments, the radiation dynamic range and the best working point of the system are determined. The experiment result shows that the dynamic range of the image system is maximal when the exposure time is 8ms in ultraviolet, 0.5ms in visible and 0.125ms in near infrared region.