Design And Research Of Photoelectric Detection System For Directional Polarization Camera

As one of the three active components of the atmosphere, Atmospheric aerosol is an important factor which influences the climate, environment, and quantitative remote sensing.Multi-spectral and multi-angle observation data has always been used to retrieve aerosol parameters. Polarimetric remote sensing technology makes the earth atmosphere radiation information quantity changes from scalar to vector, and then we can realize the observation of atmospheric aerosol more accurately and effectively.Multi-spectral, multi-angle and polarimetric imaging remote sensing is the optimal approach to realize large scale, high frequency and global atmospheric aerosol observation.From the investigation of polarimatric observation theory and retrieval algorithm of atmospheric aerosol, adequate discussing of the key characteristics of the instrument, technical proposal of a space-borne, multi-spectral, multi-angle and polarimetric remote sensing instrument is determined, and then contrapuntally analyzed the main error factor of this Photoelectric detection system. This dissertation mainly analyzed the photoelectric characteristics of frame transfer CCD, discussed the importance of device level performance testing to calibration of the instrument, and then studied the influence of dark signal and relative spectral response and the calibration method which strongly associating with temperature. Combing the requirement of wide view imaging observation mode, analyzed the necessity of anti-blooming function, studied the correction method of frame transfer smear, designed a window readout timing sequence, and ultimately guaranteed the efficiency of correction method would not be influenced by the saturated pixels.On the basis of the above, we designed the photoelectric system of this satellite-borne directional polarization camera. According to the characteristics of on obit working mode, we analyzed the influencing of operational timing accuracy to the data precision, and delicately designed drive circuit of CCD and steering wheel, all these ensured the data validity of this time-sharing polarization detection of this directional polarization camera. At the end of this dissertation, laboratory calibration and performance measuring were carried out, and the contrastive external field test result verified key performance and the feasibility to application requirement.