Acta Optica Sinica, Volume. 39, Issue 8, 0830001(2019)
Research on Calibration-Free Fixed-Point Wavelength Modulation Spectroscopy Based on Wavenumber Drift-Correction Algorithm
In the long-term operation of distributed feedback laser, there exists a problem of wavenumber drift of the output laser center; this affects the measurement accuracy of gas concentration by fixed-point wavelength modulation spectroscopy. In order to solve this problem, a calibration-free fixed-point wavelength modulation spectroscopy based on the wavenumber drift-correction algorithm is proposed for the calibration-free measurement of gas concentration. The absorption spectrum at 4958.97 cm -1 is selected to measure the concentration of CO2 gas for validating the accuracy of this method. The experimental results show that the proposed correction algorithm overcomes the adverse effect of wavenumber drift of the output laser center on the measurement, and effectively improves the accuracy of gas-concentration measurement.
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Yangkun Zhu, Bin Zhou, Yihong Wang, Jiuxiang Lian, Hanqing Wang, Ciwei Chen. Research on Calibration-Free Fixed-Point Wavelength Modulation Spectroscopy Based on Wavenumber Drift-Correction Algorithm[J]. Acta Optica Sinica, 2019, 39(8): 0830001
Category: Spectroscopy
Received: Mar. 5, 2019
Accepted: Apr. 22, 2019
Published Online: Aug. 7, 2019
The Author Email: Zhou Bin (zhoubinde@seu.edu.cn)