Qualitative and quantitative analysis of atmospheric methanol using a continuous-wave terahertz spectrometer

Han Zhang; Zhaohui Zhang; Xiaoyan Zhao; Xiaotong Zhang; Tianyao Zhang; Can Cao; Yang Yu

doi:10.3788/COL201816.103001

Journals >Chinese Optics Letters >Volume 16 >Issue 10 >Page 103001 > Article

Chinese Optics Letters
Vol. 16, Issue 10, 103001 (2018)

Qualitative and quantitative analysis of atmospheric methanol using a continuous-wave terahertz spectrometer

Han Zhang^1、2, Zhaohui Zhang^2、3、*, Xiaoyan Zhao³, Xiaotong Zhang¹, Tianyao Zhang³, Can Cao³, and Yang Yu³

Author Affiliations

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

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DOI: 10.3788/COL201816.103001 Cite this Article Set citation alerts

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 Copy Citation Text

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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.