2012•Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIERequires access
Effect of temperature on methane gas concentration by tunable diode laser absorption spectroscopy
Yanjie Zhao, Yanfang Li, Tingting Zhang, Chang Wang, Tongyu Liu
Open publisher page 1 citations
Abstract
The effect of temperature on gas absorption characteristics is obvious. When the tunable diode laser absorption spectroscopy (TDLAS) technique is applied to monitor the methane gas concentration, the influence of temperature must be correction in order to measure the gas concentration accurately. Based on HITRAN database, the absorption characteristics of methane near infrared spectrum with temperature have been researched. Then a multiplexed fiber optic methane monitoring system is designed and the distributed feedback (DFB) laser is employed as laser source. The effect of the temperature on the system is emphasized. The results show that it obviously improved concentration precision by compensating retrieval concentration. It is valuable references for the gas detection in practical applications.