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

To address performance degradation caused by detector temperature fluctuations in a dual-channel 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 optimal 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. Comparative experiments demonstrated that the integrated control module significantly enhances the system performance. 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 Temperature Difference（NETD）is improved by 19. 35%，from 14. 379 mK to 11. 597 mK. In the SF₆ gas detection 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 effects 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.