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.