我国众多化工园区及燃气管线存在有毒有害气体泄露的风险，一旦发生泄露可能会造成重大环境污染和安全事故，因此如何快速发现、准确定位危险气体的泄露位置以及泄漏程度具有重大的现实意义。可调谐二极管激光气体传感器具有响应快、精度高、可遥测等优点，在测量园区内气体泄漏方面有着巨大的优势。本课题研究了用于人工智能巡检系统的激光气体传感器，利用可调谐二极管激光吸收光谱技术，实现对工业泄漏气体（以甲烷为例）的实时、高精度监测。 本文首先介绍了可调谐二极管激光吸收光谱技术的测量原理，其次，在实验室内使用波长调制法进行了甲烷浓度的测量，并对实验结果进行分析。随后，在此基础上，改进了用于人工巡智能检系统的激光气体传感器，结合光开关器件，将单测量光路扩展至32路测量光路，并将32路测量光路与4个指示激光排列成规则的矩阵样式（6 x 6排布），通过光开关的快速切换，得出矩阵光路照着截面的目标气体浓度信息。设定预警浓度，超过危险浓度的阈值自动报警。对比传统测量方式，本文设计的用于人工巡智能检系统的激光气体传感器可遥测、精度高，具有较高的推广前景和实用价值。

In China，the risk of hazardous gas leak exists in many chemical industrial estates and gas pipelines. Once a leak occurs, it may cause major environmental contamination and serious safety accidents. Therefore, it is of great practical significance to quickly detect and locate the accurate position of hazardous gas leak with the measurement of its degree. The tunable diode laser gas sensor has the advantages including fast response, high precision, and remote measurement, which contribute to its strength in measuring the gas leak in the industrial estates. This research aims to study the laser gas sensor applied to the artificial intelligence inspection system in order to achieve real-time and high-precision monitoring of industrial gas leak (taking methane as an example) with technique of tunable diode laser absorption spectroscopy. In this paper, the measurement principle of tunable diode laser absorption spectroscopy is introduced. Secondly, the concentration of methane is measured in the laboratory with the application of wavelength modulation method, while the data and result of the experiment are analyzed. Subsequently, based on the analysis, corresponding improvement and modification are conducted on a laser gas sensor for an artificial patrol inspection system. In combination with an optical switching device, a single measurement optical path is extended to 32 measurement optical paths, and 32 measurement optical paths are arranged with 4 indicator lasers into a regular square array (6 x 6). Through the quick switching of the optical switch, the concentration of the target gas information whose cross section is exposed to the square array of light paths. In addition, after setting the concentration for warning, if the gas concentration exceeds the threshold of dangerous concentration, the automatic alarm will be triggered. Compared with traditional measurement methods, the laser gas sensor designed for artificial patrol inspection system in this research can achieve remote measurement with high precision. Thus, this thesis has bright prospects and practical value.