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应用取样光纤光栅滤波、近红外光谱和改进的差分吸收检测技术,实现了对甲烷气体等距分布的多条近红外吸收线的同时测量,完善了差分吸收技术应用于弱气体检测的理论。分析了差分吸收检测的基本原理,并结合光源强度调制技术,建立甲烷检测的数学模型。实验结果表明该检测系统性能稳定、灵敏度高,适于检测甲烷。
By using sampling fiber grating filter, near infrared spectroscopy and improved differential absorption detection technology, simultaneous measurement of multiple near infrared absorption lines equidistantly distributed on methane gas is achieved, and the theory of differential absorption technique applied to weak gas detection is improved. The basic principle of differential absorption detection is analyzed. Combined with the light source intensity modulation technique, a mathematical model of methane detection is established. Experimental results show that the detection system has stable performance and high sensitivity and is suitable for detecting methane.