Chinese Optics Letters, 2018, 16 (10): 103001, Published Online: Oct. 12, 2018   

Qualitative and quantitative analysis of atmospheric methanol using a continuous-wave terahertz spectrometer Download: 867次

Author Affiliations
1 School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Beijing Engineering Research Center of Industrial Spectrum Imaging, Beijing 100083, China
3 School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract
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.

Han Zhang, Zhaohui Zhang, Xiaoyan Zhao, Xiaotong Zhang, Tianyao Zhang, Can Cao, Yang Yu. Qualitative and quantitative analysis of atmospheric methanol using a continuous-wave terahertz spectrometer[J]. Chinese Optics Letters, 2018, 16(10): 103001.

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