Huinan Yang, Ning Chen, Jun Chen. Measurement of Low-Concentration Water Vapor Based on Off-Axis Integrated Cavity Absorption Spectroscopy[J]. Acta Optica Sinica, 2018, 38(2): 0212005
- Acta Optica Sinica
- Vol. 38, Issue 2, 0212005 (2018)
Fig. 1. Experimental setup of off-axis integrated cavity output spectrum
Fig. 2. Transmission light intensity through off-axis integrated cavity. (a) Positive axis incidence; (b) off-axis incidence; (c) signal after 100 times average
Fig. 3. (a) Absorption spectra of water vapor at different partial pressures; (b) relationship between water vapor partial pressure and integrated absorption
Fig. 4. Fitting diagrams of absorption coefficient of water vapor. (a) Experimental data and fitting line; (b) fitting residual error
Fig. 5. Comparison of measured concentration and known concentration
Fig. 6. Variation of water vapor concentration with the injection of nitrogen with different flows
Fig. 7. Variation of water vapor concentration
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Table 1. Reflectivity corresponding to different water vapor concentrations
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