多角度偏振成像仪面阵探测器筛选及测试方法

Screening and Testing Method of Area Detectors for Directional Polarimetric Camera

为了从科学级面阵探测器中筛选出满足空间应用要求的具有高可靠性和稳定性的器件,针对星载面阵电荷耦合器件(CCD),开展了温度循环、随机振动及高温老炼等环境应力试验。设计了一套筛选专用的面阵CCD图像采集系统,并基于分段式均匀照明光源和连续可调谐均匀单色照明光源,对筛选前后面阵CCD的光电性能参数进行测试。通过对比筛选试验前后面阵CCD的暗电流、像元响应非一致性、量子效率及非线性误差等参数,分析面阵CCD的环境适应性,剔除早期失效或性能变化较大的探测器,从中筛选出性能最优的探测器,并将其应用于星载多角度偏振成像仪以进行大气遥感观测。试验结果表明,最终优选的探测器在筛选试验前后的量子效率最大变化为-2.56%,像元响应不一致性均小于3%,非线性误差均小于1%,筛选后暗电流为889.22 electron·(pixel·s^-1)^-1。研究结果为低等级面阵CCD筛选方法及CCD性能评估技术提供了重要参考。

To screen the high reliability and stability devices from the scientific grade area detectors for the aerospace application,the environmental stress screening tests such as temperature cycling,random vibration,and burn-in are performed on the space-borne area charge coupled device(CCD).A system for area CCD image acquisition is designed,and the electro-optical parameters of a CCD are tested before and after screening based on the segmented illumination light source and the continuous tunable monochromatic light source.The differences of dark currents,photo response non-uniformity,quantum efficiencies,linearity errors,and other parameters of the area CCD before and after the environmental reliability tests are compared,the environmental adaptability of the area CCD is analyzed,and thus the quality defects and the early failures are eliminated.Subsequently,the detectors with an optimal performance are extracted from the participating area CCD and used in the space-borne directional polarimetric camera for atmospheric remote sensing observation.The experimental results show that the maximum change of quantum efficiency between pre-and post-screening for the ultimate optimal detector is-2.56%,the photo response non-uniformity is smaller than 3%,the linearity error is smaller than 1%,and the dark current is 889.22 electron·(pixel·s^-1)^-1 after screening.These research results provide significant reference data for the standardization establishment of low-level CCD screening methods and performance assessment techniques in aerospace field.