摘要
We present a specific-window method to subtract the interference of water vapor on terahertz frequency-domain spectroscopy（THz-FDS） at ambient temperature and pressure. A continuous-wave spectrometer based on photomixing was utilized to obtain THz-FDS of methanol vapor in the range of 50–1200 GHz. The distinctly spaced absorption features in the neighborhood of atmospheric windows of transparency were selected to perform linear fitting versus the calculated absorption cross section and obtain the concentration of methanol. Furthermore, the gradually decreased methanol vapor was quantified to demonstrate the reliability of the method.
We present a specific-window method to subtract the interference of water vapor on terahertz frequency-domain spectroscopy（THz-FDS） at ambient temperature and pressure. A continuous-wave spectrometer based on photomixing was utilized to obtain THz-FDS of methanol vapor in the range of 50–1200 GHz. The distinctly spaced absorption features in the neighborhood of atmospheric windows of transparency were selected to perform linear fitting versus the calculated absorption cross section and obtain the concentration of methanol. Furthermore, the gradually decreased methanol vapor was quantified to demonstrate the reliability of the method.
作者
Han Zhang
Zhaohui Zhang
Xiaoyan Zhao
Xiaotong Zhang
Tianyao Zhang
Can Cao
Yang Yu
张寒;张朝晖;赵小燕;张晓彤;张天尧;曹灿;于洋(1School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China ; 2Beijing Engineering Research Center of Industrial Spectrum Imaging, Beijing 100083, China ;3School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing 100083, China)
基金
supported by the China Postdoctoral Science Foundation(No.2017M610771)
