酒精是相对复杂的分子,在常压下为宽带吸收,其OH基团的泛频吸收区位于近红外70007300 cm-1处。 利用可调谐二极管激光光谱学(TDLAS)方法测量了含有少量水汽的酒精蒸汽在7180 cm-1附近的吸收谱线,通过 多项式拟合消除水汽吸收谱线干扰,获得了酒精蒸汽的特征吸收光谱,其半高半宽为1.3 cm-1; 并对不同浓度酒精蒸汽吸收谱线线型做了研究,证明其线型与酒精分压不相关,为发展基于TDLAS酒驾遥测技术奠定了基础。

Ethanol is a relatively complex molecule which presents broadband absorption spectra at atmospheric pressure,its stretching overtones of OH bond is around 70007300 cm-1. The absorption spectrum of ethanol vapor with small amount of water vapor near 7180 cm-1 was acquired by adopting tunable diode laser absorption spectroscopy (TDLAS) method, an absorption feature with HWHH of approximately 1.3 cm-1 was obtained by eliminating the interference of water vapor with polynomial fitting. Study on the line-types of absorption spectra of ethanol vapor with different concentrations demonstrates that line-types have no dependence on partial pressure. This work laid the foundation for the research of ethanol remote sensing based on TDLAS.