| With the rapid development of industry and agriculture, safety and environment protection of mine, oil field and electric power system is of great importance more and more. Thousands upon thousands of large-scale power factories and mine exhaust a great deal of flammable, explosive and poisonous gas in the air, and the living space and safety of human's are seriously menaced, so rapid and real-time measurement of the gas is very important for safety production of mine and environment protection.In this paper, the main component of mine gas methane is used as a research sample. An gas analytical system is achieved using non-dispersive infrared (NDIR) techniques which are based on the fact that many gases have unique infrared absorption signatures in the specifically region. The system has the advantages of fast responding speed, freedom from inflammation and explosion, large dynamic range and freedom from poisoning, and the detecting segment can be placed in the flammable, explosive, poisonous places that people can't come in and instruments can't be placed in. Thus the concentration of methane can be remote real-time detected, and the system will give an alarm to people when it is dangerous, so the explosive accident caused by gas in mine can be avoided.After analyzing the theory of selective absorption of gas, the absorption spectra of methane are confirmed and we describe the academic base of the measurement of the gas by absorption theory.Design a detect method based on one wavelength through two ray channel.Using difference absorption measurement eliminate the astaticism of lamp-house and electrocircuit.The gas analytical system consists of the following: infrared light source, thin-film filter,and infrared detector which is associated electronics.Analyze how to use DSP achieve collection,display and transmission.The results of the measurement using the gas analytical system display that the system is stable.
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