研制了基于可调谐激光吸收光谱法的甲烷和乙烯的同步检测系统.该系统主要利用工作在1.626 μm附近的DFB激光器结合长光程吸收池来实现的.通过系统检测以及光谱数据库获取乙烯和甲烷在1.626 μm波长附近的吸收光谱信息，分析谱线的强度、位置以及相互之间的关系，采用最小二乘法建立谱线分析方法.以质量流量计为标准，系统的浓度测量精度可达到5%.

A tunable diode laser absorption spectroscopy system with a multi pass cell and a DFB laser diode at wavelength 1.626 μm has been developed for simultaneous measurement of ethylene and methane. A line separation method based on multi absorption peak using the least squares algorithm has been established. The characteristic peak positions and relative intensities of ethylene and methane were determined by available spectral structures from previous investigations and available databases. The accuracy of the measured concentration is within 5% comparing with the mass flow meter.