热电制冷主动温控对双通道非制冷红外SF6检漏系统性能的提升OA

To address performance degradation caused by detector temperature fluctuations in a dual-chan-nel infrared imaging system for sulfur hexafluoride(SF6)gas leak detection,this study developed an active temperature control module based on a Thermoelectric Cooler(TEC)to enhance its stability.The opti-mal spatial layout of the TEC was determined by combining experimental measurements with thermal field simulations,and a closed-loop control system governed by a PID algorithm was implemented.Compara-tive experiments demonstrated that the integrated control module significantly enhances the system perfor-mance.Regarding imaging quality,the steady-state standard deviation of the grayscale value is reduced by 40.87%,the linearity error is decreased from 7.253 4%to 0.660 4%,and the Noise Equivalent Temper-ature Difference(NETD)is improved by 19.35%,from 14.379 mK to 11.597 mK.In the SF6 gas detec-tion application,the average relative contrast,signal-to-noise ratio,and gas pixel ratio are increased by 123%,56%,and 77%,respectively.This enhancement method effectively suppresses the adverse ef-fects of temperature fluctuations,substantially improving SF6 gas detection capability while enhancing the fundamental imaging quality,and validating a feasible technical pathway for developing high-performance,low-cost portable gas leak detection instruments.