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788 nm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5.7 cm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 laser diode as an optical source for methane gas detection. The spectral characteristics of the Tm doped fibre pumped by the 788 nm laser diode is studied experimently and the fibre source is used in a correlation spectroscopy measurement system. With a short measurement cavity of 5.7 cm in length, a system noise level limited minimum detectable gas concentration of 0.47% is obtained. This value is far below the lower explosion level (5%) of methane gas. Thus it demonstrated the feasibility of using Tm doped fibre as an optical source for methane gas measurement.