采用Tm光纤光源的甲烷气体相关光谱检测

Detection of Methane Gas with Fibre Correlation Spectroscopy, Using Semiconductor Laser Diode Pumped Tin-doped Fibre Source

报道了以半导体激光器泵浦掺Ｔｍ３＋光纤为光源的甲烷气体相关光谱检测系统，研究了７８８ｎｍ波长泵浦下掺Ｔｍ光纤光源的一些光谱特性，并在实验上用这种光源及系统对甲烷气体作了测量。在５．７ｃｍ长的测量腔下，系统噪声幅度对应的最小气体检测浓度为０．４７％，远低于甲烷气体的爆炸低限（５％），证明了这种光纤光源用于甲烷气体浓度测量的可行性。

This paper reports results of Tin doped fibre pumped by a semiconductor laserdiode as an optical source for methane gas detection.The spectral characteristics of the Tindoped fibre pumped by the 788 nm laser diode is studied experimently and the fibre source isused in a correlation spectroscopy measurement system. With a short measurement cavity of5. 7 cm in length,a system noise level limited minimum detectable gas concentration of0. 47% is obtained. This value is far below the lower explosion level (5%) of methanegas. Thus it demonstrated the feasibility of using Tin doped fibre as an optical source formethane gas measurement.