The Design and Implementation of Methane Detector with Tunable Laser

This paper studies the design of methane (CH4) detector with tunable diode laser based on the principle of infrared absorption of methane. The infrared rays launched by the tunable diode laser can be used to detect the gas leakage. It can convert the optical signals received by the convergent lens to electrical signals by optical devices. The signals will be amplified by the filter. Then the digital processor will deal with the analysis and display for the signals. This kind of detector can be widely used in industrial detection of methane, detecting gas exceeded in coal mine, the detection of harmful gas in the air, detecting gas leakage of the pipeline in family and other occasions on the detection of methane´s concentration.