基于可调谐半导体激光吸收光谱技术开展了检测空气中乙醇蒸气浓度的方法研究，并采用乙醇分子在7180 cm-1（1393 nm）附近的吸收峰作为鉴别乙醇的特征信息。建立多元线性回归方程来拟合求解多分子吸收共存的问题，以消除共存水蒸气对空气中乙醇蒸气含量检测的干扰。针对谱线处理中存在的光谱误差问题，提出了修正方程，与实验的结果一致。开放光路测量实验结果表明，系统的积分浓度检测限达到30×10-6 m。

The detection method for ethanol vapor concentrationin air based on tunable diode laser absorption spectroscopy is studied using narrow absorption peak in the vicinity of 7180 cm-1 (1393 nm) as an identification feature of ethanol molecule. To eliminate the interference of coexisting water vapor with the detection for ethanol vapor concentration in air, multidimensional linear regression analysis is applied to solve the problem of the coexistence of multiple molecule absorptions. A modification equation is promoted to resolve the problem of spectral error in the spectral data processing procedure, which is proved by experiments. The detection limit of integrated concentration is obtained by open-path measurement experiments as 30×10-6 m.