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
- Chinese Optics Letters
- Vol. 16, Issue 10, 103001 (2018)
Fig. 1. Schematic diagram of THz-FDS system for gas detection.
Fig. 2. Dynamic range of scanning THz signal of air (dashed line) and vacant gas cell (solid line).
Fig. 3. Averaged amplitude of THz electric field signal of methanol sample (bottom) and reference (top).
Fig. 4. Calculated absorption cross section (bottom) from 100 to 1090 GHz compared with the experimental absorbance (top).
Fig. 5. The linear regression on the absorption peaks of methanol.
Fig. 6. Three frequency sub-bands of absorbance spectra of nine samples with gradually reduced methanol vapor.
Fig. 7. Relative standard deviation (RSD) of THz signal for vacant chamber.
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Table 1. Linear Regression Results and Correctness of Fitting
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