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当前国内外研制的气体传感器,多采用半导体气敏材料与气体接触,伴随表面吸附或化学反应,而导致其导电性能变化来检测气体浓度。这种传感器的测量电极和加热丝与气敏材料构成元件,它不适于测量腐蚀性气体和在高温下使用;而气——磁传感器,供磁性能测定的感应线圈,是与测量气氛和气敏材料通过石英管隔开的,它可在高温和腐蚀性气氛中长期使用,适于化工生产中有毒气体的检测。
At present, gas sensors developed at home and abroad mostly use semiconductor gas-sensitive materials to contact gas and detect the concentration of gas with the change of electrical conductivity accompanying the surface adsorption or chemical reaction. This sensor measuring electrodes and heating wire and gas-sensitive material components, it is not suitable for measuring corrosive gases and at high temperatures; and gas - magnetic sensor for the determination of the magnetic induction coil is measured with the gas atmosphere and gas The material is separated by a quartz tube, which can be used for a long time in a high temperature and corrosive atmosphere, suitable for the detection of toxic gases in chemical production.