Introduction: Gas detection has become increasingly important in modern industry and environmental monitoring. One of the key tasks is to detect methane gas concentration, as methane is a common greenhouse gas that has significant impacts on climate change and environmental safety. In order to provide efficient and accurate gas concentration detection solutions, methane laser sensors have emerged. This article will introduce the principle, advantages, and application areas of methane laser sensors. Principle: The methane laser sensor is based on Laser Absorption Spectroscopy (TDLAS) technology. It uses a laser beam with a specific wavelength of 1653.7nm to measure the absorption spectrum of methane molecules in the gas being tested. By measuring changes in absorption intensity, the concentration of methane gas can be derived. This technology has the characteristics of high sensitivity, fast response, and high resolution.                   Advantages: Compared to traditional gas sensors, methane laser sensors have the following advantages: a) High sensitivity: Methane laser sensors have high sensitivity to methane gas and can detect extremely low concentrations of methane, typically in the ppm (parts per million) or ppb (parts per billion) range. b) Accuracy: Laser absorption spectroscopy technology can provide highly accurate measurement results, reducing false alarms and errors. c) Real time monitoring: The methane laser sensor has real-time monitoring function, which can quickly respond to emergency situations such as methane leakage and improve safety. d) Long lifespan: The methane laser sensor uses a reliable laser light source, which has a long service life and stability. Application areas: Methane laser sensors have a wide range of applications in various fields, including but not limited to: a) Industrial safety: Methane laser sensors can be used for monitoring methane leaks in fields such as petroleum, natural gas, and chemical engineering, providing rapid response and ensuring the safety of the working environment. b) Environmental monitoring: Methane is a greenhouse gas that has a significant impact on climate change. Methane laser sensors can be used for environmental applications such as atmospheric monitoring and greenhouse gas emission monitoring, helping to assess and reduce methane emissions. c) Mine safety: Methane is a common combustible gas that can easily cause explosions during mining operations. Methane laser sensors can be used for methane gas detection and alarm, ensuring the safety of miners. d) Gas energy detection: Methane is the main component of natural gas, and methane laser sensors can be used for natural gas exploration and downhole operations, providing key gas concentration information. Conclusion: Methane laser sensors, as an efficient and accurate gas detection solution, are widely used in industrial and environmental fields. Its high sensitivity, accuracy, and real-time monitoring capabilities make it an important tool for improving safety and environmental monitoring levels. With the continuous advancement of technology, methane laser sensors will continue to develop and play a role in more fields, promoting sustainable development and environmental protection.