Tao Wu, Dong Xu, Xingdao He, Rong Lai, Tao Cheng. Off-Axis Integrated Cavity Output Spectroscopy Technique Based on Wavelength Modulation[J]. Acta Optica Sinica, 2017, 37(8): 0830002
- Acta Optica Sinica
- Vol. 37, Issue 8, 0830002 (2017)
Fig. 1. Schematic of WM-OA-ICOS measurement system
Fig. 2. Simulation of CH4 and H2O absorbance near 7185.87 cm-1 using HITRAN 2012 database
Fig. 3. Relationship between modulation amplitude and 2f signal peak height at different pressures
Fig. 4. Variations of 2f signal peak height with (a) modulation phase and (b) modulation frequency
Fig. 5. (a) Relationship between 2f signal peak height and time; (b) Allan variance
Fig. 6. Waveforms of (a) 2f signal and (b) 1f signal at different CH4 concentrations
Fig. 7. Measured (a) 2f signal peak height and (b) 1f signal medium value over a long period of measurement for CH4 of ten different concentrations
Fig. 8. Variations of 2f signal peak height and the ratio of 2f signal peak height to 1f signal medium value (2f/1f) with CH4 concentration
Fig. 9. (a) Variations of 2f signal peak height and 2f/1f value with time; (b) linear relationship between 2f signal peak height or 2f/1f value and CH4 concentration
Fig. 10. (a) Absorption line of CH4 and (b) fitting residual obtained by OA-ICOS technique
Fig. 11. 2f signal obtained by WM-OA-ICOS technique
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