基于NDIR方法的多组分气体检测系统

提出了一种非分散红外多组分气体分析仪的系统设计方案,设计的滤光轮起到了光学滤波和调制光波的双重作用,多次反射池有效地增加了气体的吸收光程,分析仪使用一个探测器就能完成多种气体的测量。综合考虑光源辐射强度、滤光片透过率及探测器响应能力的影响,通过理论分析计算与实验研究,获得了各通道理想的零气背景信号。对分析仪进了浓度定标,各目标滤波通道的定标拟合相关系数均在0.998以上。将分析仪的实际测量值与标准值进行比较,各种气体的测量相关系数均在0.99以上。

Non- dispersive infrared multi- component gas analysis system

A type of optical system design for non-dispersive infrared(NDIR) multi-component gas analyzer was described.The filter wheel of this system could both filter and modulate the optical signal and its multiple reflection cell could increase the effective optical path length of the modulated optical signal.The analyzer had the ablility of measuring mutiple gases with one detector.Radiation intensity of the optical source,transmission of the filters and response ability of the detector were all taken into account when doing theoretic analytical calculation and experimental study.The best zero gas signal intensity at each filter channel was obtained.The concentration inversion relationship of each filter channel after interference correction was calibrated.The fitting correlation coefficients of all filter channels are above 0.998.When the measured concentration readings of NDIR gas analyzer is compared with the standard concentrations,the measuring correlation coefficients are all above 0.99.