Design of a natural gas leak detection system with tunable diode laser absorption spectroscopy

Tunable diode laser absorption spectroscopy (TDLAS) was used for natural gas leakage detection, and its principle was analyzed. The selection of the diode laser and the photodiode for natural gas leakage detection system and the characteristics of the laser diode and photodiode were introduced. The measurement results show that the lowest gas detection level is 27×10-6 and gas change times per minute is 93~113 times/min. The gas concentration along the natural gas line with number modulation was obtained, and a natural gas line leakage detection method was proposed.