Linquan Lai, Yue Chen, Kongtao Chen, Jiale Tang, Kaiwen Yin, Fuqiang Jia, Dun Qiao, Yuanlong Fan, Kang Li, Nigel Copner. Reconstruction and fitting of second-harmonic signals by wavelength modulation spectroscopy method based on fast Fourier transform[J]. Chinese Optics Letters, 2022, 20(9): 093001
- Chinese Optics Letters
- Vol. 20, Issue 9, 093001 (2022)
Fig. 1. Experimental setup for the validation of the proposed method.
Fig. 2. (a)–(d) Represent the simulated process of extracting second harmonic using the WMS method. (b), (e)–(g) Represent the simulated process of extracting second harmonic using the FFT-WMS method.
Fig. 3. (a) Second-harmonic signal extracted from the lock-in amplifier using the WMS method. (b) Second-harmonic signal reconstructed by FFT-WMS.
Fig. 4. Relationship between the peak value of the second-harmonic signal and the gas concentration under FFT-WMS.
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Table 1. Comparison of Concentration Results Measured by Two Methods
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