针对中国科学院上海技术物理研究所研制的1500元红外线列焦平面探测器的输出特性,提出了以低噪声运放为核心的信息获取电路和以FPGA(Field Programmable Gate Array)为核心的数据预处理的设计方案,实现了驱动电路和探测器的良好匹配,较好地发挥了探测器高灵敏度的特性.测试结果表明,该方案不仅对系统获得优于50 mK噪声等效温差的高灵敏度成像起到了重要作用,足够宽的量化设计还保证了系统的动态范围和图像的丰富层次.该设计方案已成功应用在一些其他类型的红外焦平面探测器中.
Based on lucubrating the output characteristic of the infrared focal plane detector with 1500 pixels, which is made by Shanghai Institute of Technical Physics, Chinese Academy of Sciences, we develop a kind of circuit of information acquisition with the kernel of low-noise amplifier and a project scheme of data pre-processing with the kernel of FPGA. This design makes the driving circuit and the detector match well so that the high sensitivity character of the detector is fully exerted. The testing results indicates that this design plays an important role in acquiring a Noise Equivalent Temperature Difference (NETD) better than 50 mK, and the wide band quantization design guarantees the dynamic scope and abundant image levels of the system. This design is applied successfully in infrared focal plane detectors of some other kinds.