Shaomin Li, Liqun Sun. Natural logarithm wavelength modulation spectroscopy[J]. Chinese Optics Letters, 2021, 19(3): 031201
- Chinese Optics Letters
- Vol. 19, Issue 3, 031201 (2021)
![Absorption coefficient of water vapor around 1392 nm (P = 1 atm, T = 296 K) based on HITRAN[19]. The non-absorbing region is indicated by the dotted rectangle.](/richHtml/col/2021/19/3/031201/img_001.jpg)
Fig. 1. Absorption coefficient of water vapor around 1392 nm (P = 1 atm, T = 296 K) based on HITRAN[19]. The non-absorbing region is indicated by the dotted rectangle.
Fig. 2. Second harmonic R2f demodulated from the absorption signal.
Fig. 3. Schematic of the experiment setup.
Fig. 4. Detected signal from the photodetector. The non-absorbing region is indicated by the dotted rectangle.
Fig. 5. Response of ln-WMS-2f (black dots) and WMS-2f (red inverted triangles). The black line represents the linear fit of ln-WMS-2f versus volume fraction.
Fig. 6. (a) η retrieved with the η-seeking algorithm during 90 s of continuous measurement (0.1 s per measurement); (b) frequency distribution histogram of η; (c) mean of
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Table 1. Pseudocode of
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