催化燃烧与红外吸收原理可燃气体探测器探讨

Combustible Gas Detector-Inquire into Low Temperature Catalytic Burning & Infrared Absorption Types

工业生产中得到广泛应用的可燃气体探测器主要有两种不同检测原理,即低温催化无焰燃烧和非色散红外吸收原理。文章分析了催化燃烧原理适应性、温度补偿的实现、线性输出的机理以及它依赖氧气、某些气体使其丧失催化性能等应用局限性;同时,分析红外吸收原理中红外波长的选择,光路、光源和吸收器等对探测器性能的影响;并指出两种原理各有特点和优点,针对不同场合正确选型,使可燃气体探测器可靠运行,保障环境安全。

There are two inspection principles, low temperature catalytic burning and infrared absorption, for combustible gas detectors which have been widely applied in industries. In this paper, for catalytic burning principle, adaption, realization of temperature compensation, mechanism of linear output and limitation that catalytic feature may be lost for some medium were analyzed. At the same times, for infrared absorption principle, the selection of infrared wave length and influences of light way, light source and absorber were also analyzed. It was indicated that two principles have their pros and cons respectively, it needs to select correct type for various conditions, with which combustible gas detector can be operated stably and safe operation may be ensured.