气体泄漏的单点探测器与红外成像检测的灵敏度模拟分析

Model analysis of the sensitivity of single-point sensor and IRFPA detectors used in gas leakage detection

危险气体泄漏引发的事故及灾难对人身安全和社会稳定造成巨大威胁,及时有效地检测到气体泄露、定位泄漏源以及评估气体扩散趋势等成为研究人员关注的热点。与目前各种单点气体探测器固定位置并通过气体扩散进行泄漏气体探测不同,基于红外焦平面探测器的红外成像气体泄漏检测技术对可能的泄露点进行成像检测。由于这两种探测器本身的灵敏度差异较大,且工作原理也有所不同,所以如何评价两者的探测效率成为人们关心的问题。因此,基于计算流体力学软件FLUENT对两种探测器在室内空间环境的检测灵敏度进行了模拟分析,比较了两者在实际应用中的优缺点,指出红外焦平面探测器在响应速度和实际检测灵敏度等方面的独特优势,对红外成像气体泄漏检测技术的进一步发展具有推动作用和借鉴意义。

Serious accident caused by hazardous gas leakage is a threat to the safety of people and community. So detecting gas leakage, locating leaking source and evaluating spreading tendency effectively is of great importance to avoid these accidents. Different from the single-point sensor which detects gas leakage relying on the gas diffusion, infrared imaging system is based on Infrared Focal Plane Array （IRFPA） to find the potential leaking source. There are differences in sensitivity and operational principle between these two kinds of detection methods. Thus, according to the simulation result about the actual sensitivities of these two kinds of detectors under common condition based on fluid dynamics software, namely FLUENT, the pros and cons of their applications were summarized. Besides, it was pointed out that IRFPA had advantages on response speed and actual sensitivity, which meant a lot to the application of infrared imaging gas leakage detection.