热释电型非制冷焦平面热像仪调制斩波器的分析--斩波器的曝光效率

对阿基米德螺旋线调制斩波器的曝光效率进行了理论分析和数值模拟，得到斩波器曝光效率对后续信号处理的影响．曝光效率直接影响后续探测器单元的曝光时间及入射辐射信号，与探测器信号读出时刻共同影响探测器有效积累电荷的均匀性；同时应在斩波器中增加调制同步定位点，可使热像仪适宜不同曝光效率的斩波器．在热成像系统设计以及电子处理系统设计时，必须综合考虑斩波器曝光效率的影响．

ANALYSIS OF MODULATING CHOPPER USED IN PYROELECTRIC UNCOOLED FPA THERMAL IMAGER--CHOPPER'S EXPOSURE EFFICIENCY

The archimedes spiral cord modulating chopper's exposure efficiency was theoretically analyzed and numerical simulated, and its impact on the following signal processing was obtained. Results show that chopper's exposure efficiency directly affects detector pixels' exposure time and incident radiation, and affects the detector pixels' effective accumulated charge's uniformity with detector's signal readout time coordinately. Modulating synchronization locating point should be added in the chopper, which can make thermal imager be compatible with different exposure efficiency chopper. The effect of the chopper's exposure efficiency should be synthetically considered when the whole thermal imaging system and its electronic processing system are designed.