| Citation: | DUAN Fen-kai, JIANG Lun, SONG Yan-song, WANG Wu, DING Xiao-kun, DONG Ke-yan. Thermal radiation suppression and cooling optimization in infrared and laser composite detection systems[J]. Chinese Optics. doi: 10.37188/CO.2025-0029
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Addressing the critical challenge of thermal radiation noise suppression in infrared systems for long-range dim target detection, this paper presents a composite detection system with an optimized cooling-based thermal radiation suppression scheme. A common-aperture optical configuration capable of simultaneous long-wave infrared and laser dual-band detection is achieved through a Ritchey-Chrétien (R-C) optical structure and a dichroic-secondary mirror with a hollow design. To mitigate thermal radiation noise, the thermal emission characteristics within the temperature range of 230 K to 320 K were analyzed using Planck’s law and non-sequential ray tracing. An improved detection range model incorporating noise terms was developed. The cooling strategy was optimized via dynamic programming, leading to an optimal solution where the main mirror and folding mirror baffles are cooled to 220 K. Experimental results demonstrate that the detection range at 300 K ambient temperature increases from 300 km to 430 km, and remains above 400 km across the entire 230−320 K range. The proposed dual-band composite detection scheme and zoned cooling methodology provide a valuable reference for the design of cold optical systems and long-range weak target detection.
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