温度影响可调谐半导体激光器吸收光谱（TDLAS）式气体监测的准确性，研究了一种甲烷、温度同时检测的系统，两种参数互相校正，提高了气体监测的准确性，同时也提高了温度的检测精度。系统采用1653.7 nm中心波长的分布反馈（DFB）半导体激光器，采用锯齿波调制激光器使其波长扫描，同时扫描出光纤布拉格光栅（FBG）波长以及气体吸收强度，从而可以测出温度和甲烷两个检测量。温度检测可以校正由于温度变化引起的气体检测误差，同时，气体吸收线位置又可以为FBG进行准确的波长定位，使得温度检测精度更高。这种温度、甲烷双参数检测系统更加稳定可靠，更适合应用于煤矿开采和瓦斯抽采等领域。

Temperature can affect the accuracy of tunable diode laser absorption spectroscopy (TDLAS) system. A system that can monitor temperature and methane in the same time is introduced. Two parameters are regulated by each other in order to increase accuracy not only in gas monitoring but also in temperature monitoring. The system uses 1653.7 nm as center wavelength of distributed feedback (DFB) laser, by taking the sawtooth signal to modulate the light frequency of the DFB laser. The scanning can obtain wavelength of fiber Bragg grating (FBG) and methane absorbing strength simultaneously. By wavelength scanning, the system can calculate temperature value and methane concentration. Temperature monitoring can regulate the deviation of methane detection caused by temperature changing, meanwhile, methane′s absorption line can locate the wavelength of FBG in order to make temperature monitoring more accurate. This temperature and methane monitoring system is more stable and reliable. It possesses wide applications in coal mine and methane extraction.