像素级数字积分红外成像技术研究

Infrared Imaging Technology Based on Pixel-Level Digital Integration

为实现更高灵敏度红外探测能力,分析了电荷处理能力与探测灵敏度之间的关系,提出了像素级数字积分探测技术。通过对红外成像链路中各噪声源的分析,建立了基于像素级数字积分探测技术的红外系统信噪比模型,并结合应用实例完成了系统关键指标参数的设计和噪声等效温差模型的仿真。仿真结果表明,像素级数字积分探测技术能够突破传统探测技术电荷处理量只有几十或几百兆电子的约束,实现千兆电子量级电荷处理能力和毫开级高灵敏度的红外系统性能。

In order to achieve high sensitivity infrared detection ability, the relationship between the charge handling capacity and the detection sensitivity is analyzed, and the pixel-level digital integration technique is introduced. By analyzing noise sources of the whole infrared imaging chains, the signal to-noise-ratio model based on the pixel level digital integration technique is established. The design of key parameters and the simulation of noise equivalent temperature difference model are accomplished combining with the application examples. The simulation results demonstrate that the pixel-level digital integration detection technique can break through the constraint that the traditional detection technology only has tens or hundreds of megabytes electron charge capacity, and it can realize the charge handling capability up to kilomega electronic magnitude and high sensitivity up to milli kelvin.