Afterstudying near-infrared selectivity absorption theory of the gas and methaneabsorption spectrum in near-infrared field, considering the attenuationcharacteristic of the transport optic fiber, the strong absorption spectrum ofmethane gas is confirmed.

• 通过对气体近红外选择性吸收的理论分析和甲烷气体在近红外吸收谱线的研究,考虑到传输光纤的低损耗特性,确定了甲烷气体的强吸收谱线。