针对调谐半导体激光光谱多组分气体检测需要，提出了一种基于多激光分时扫描的激光时分多路新方法.该方法结合了波长调制光谱技术，通过对多台检测激光器输出波长的分时扫描，在一个系统周期内实现多组分气体的准同时检测.将该方法应用于天然气泄漏红外激光多组分检测系统，通过对天然气主要成份CH4和H2S的同时测量，及时发现可能的天然气气体泄漏，在满足灵敏检测的前提下，实现了系统结构的简化.

For the demand of multiply gas species detection of tunable diode laser spectroscopy, a novel time-division multiplexing method-time sharing scanning multiplexing method is presented.Based on the wavelength modulation spectroscopy technology, quasi-simultaneously multi-species detection in one system cycle is realized by simultaneous modulating and sequencially scanning multiply lasers. This method is used in infrared laser spectroscopy based gas emission multi-component detection system.Through Quasi-simultaneously detection of CH4 and H2S concentrations, the possible gas emission monitoring is guaranteed.At the precondition of sufficient sensing sensation, the system configuration is simplified.