红外甲烷传感器直射式气室设计

摘要

针对采用反射式气室的红外甲烷传感器测量误差较大的问题,基于红外光谱吸收原理,利用非分光探测技术设计了一种新型直射式气室.该气室采用硅半导体片状红外光源、双通道红外探测器及一定长度的气室中腔,选用GaF2作为光源及探测器的视窗材料,搭配外部电路实现对CH4体积分数的监测.0～2.5％ CH4体积分数范围内的测试结果表明,采用直射式气室的红外甲烷传感器最大测量误差仅为±0.05％.%For problem of large measurement error of infrared methane sensor with reflective gas chamber, a new direct gas chamber was designed based on spectrum absorption principle of infrared light and non-spectroscopic detection technology. The infrared gas chamber achieves detection of volume fraction of methane gas by using external circuits combined with silicon semiconductor chip infrared light source, dual-channel infrared detector and midplane of gas chamber with certain length, and choosing GaF2 as window material of the light source and the detector. The test results show that the largest measurement error of the infrared methane sensor with direct gas chamber is only ± 0. 05% in the CH4 volume fraction range of 0~2.5%.