Zhang Xu, Jin Weiqi, Li Jiakun, Wang Xia, Li Shuo
Appl Opt. 2017 Apr 1;56(10):2952-2959. doi: 10.1364/AO.56.002952.
Thermal imaging technology is an effective means of detecting hazardous gas leaks. Much attention has been paid to evaluation of the performance of gas leak infrared imaging detection systems due to several potential applications. The minimum resolvable temperature difference (MRTD) and the minimum detectable temperature difference (MDTD) are commonly used as the main indicators of thermal imaging system performance. This paper establishes a minimum detectable gas concentration (MDGC) performance evaluation model based on the definition and derivation of MDTD. We proposed the direct calculation and equivalent calculation method of MDGC based on the MDTD measurement system. We build an experimental MDGC measurement system, which indicates the MDGC model can describe the detection performance of a thermal imaging system to typical gases. The direct calculation, equivalent calculation, and direct measurement results are consistent. The MDGC and the minimum resolvable gas concentration (MRGC) model can effectively describe the performance of "detection" and "spatial detail resolution" of thermal imaging systems to gas leak, respectively, and constitute the main performance indicators of gas leak detection systems.
热成像技术是检测有害气体泄漏的有效手段。由于其多种潜在应用，气体泄漏红外成像检测系统的性能评估受到了广泛关注。最小可分辨温差（MRTD）和最小可检测温差（MDTD）通常被用作热成像系统性能的主要指标。本文基于MDTD的定义和推导，建立了最小可检测气体浓度（MDGC）性能评估模型。我们提出了基于MDTD测量系统的MDGC直接计算和等效计算方法。我们构建了一个实验性的MDGC测量系统，结果表明MDGC模型能够描述热成像系统对典型气体的检测性能。直接计算、等效计算和直接测量结果一致。MDGC和最小可分辨气体浓度（MRGC）模型可以分别有效地描述热成像系统对气体泄漏的“检测”和“空间细节分辨率”性能，并构成气体泄漏检测系统的主要性能指标。
