低噪声高帧频短波红外成像系统设计

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关键词：短波红外；现场可编程门阵列；成像驱动电路；半导体制冷中图分类号：TN27 文献标识码：Adoi：10.37188/OPE.20253321.3352 CSTR：32169.14.OPE.20253321.3352

Abstract：To meet the demands for low noise and high linearity in ground-based，large-aperture shortwave infrared （SWIR） imaging systems and to circumvent international constraints on scientific-grade SWIR imaging while expediting project timelines，a cooled SWIR imaging system based on an InGaAs focal plane array （FPA）was developed.The system architecture was first established，folowed by the design of a low-noise hardware circuit incorporating thermoelectric cooling（TEC）to minimize readout noise and dark current. An FPGA-based sensor drive circuit and an optimized image readout and data-transmission program were implemented to realize a prototype. Experimental results indicate stable operation at -10°C with a maximum full-frame output rate of 116 frames per second. In low-，medium-，and highgain modes，noise levels of 364.87e- ， 40.66e- ，and 15.73e- were measured，respectively，together with excellent linearity and response uniformity. The system demonstrates robust performance and produces high-quality images in both indoor and outdoor environments，satisfying specifications for scientificgrade detectors.

Key words： shortwave infrared；Field Programmable Gate Array（FPGA）； imaging driving circuit; Thermoelectric Cooling（TEC）

1引言

InGaAs短波红外探测器具有高探测效率、高均匀性的特点，广泛应用于航空航天、医疗、军事和天文观测等领域，且针对探测器以及驱动方式的研究已经成为该领域的热点[1-2]。（剩余13211字）