Jiajin Chen, Guishi Wang, Kun Liu, Tu Tan, Xiaoming Gao. Calibration-Free Wavelength Modulation Absorption Spectroscopy for Acetylene Detection[J]. Acta Optica Sinica, 2018, 38(9): 0930001
- Acta Optica Sinica
- Vol. 38, Issue 9, 0930001 (2018)
Fig. 1. Flowchart of CF-WMS algorithm
Fig. 2. Schematic of experimental device
Fig. 3. Simulated absorption spectra of C2H2 and H2O at 6529.17 cm-1
Fig. 4. Measured background intensity Ibg(t) of N2 gas and laser intensity I(t) after passing into C2H2 gas
Fig. 5. Measured 1f-WMS signal, 2f-WMS signal,2f/1f-WMS signals, together with best fitting and residual signals
Fig. 6. Measured and fitted spectral signal of C2H2 gas with different volume fractions. (a) 10-5; (b) 4×10-5;(c) 1.2×10-4; (d) 4×10-4
Fig. 7. Corresponding relative errors of gas measured concentration and sample concentration
Fig. 8. Allan deviation of system
Fig. 9. Continuous detection results with 2f-WMS and CF-WMS
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