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Wavelength modulation spectroscopy with signal–reference beam method for highly sensitive gas detection

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Abstract

Wavelength modulation spectroscopy combined with signal–reference beam method is used for trace gas detection. The developed technique combines the advantages of common-mode noise suppression and signal-to-noise ratio improvement. The performance of the resulting water vapor sensor is markedly improved because of scanning baseline suppression, effective suppression of the target gas content in the components and resistance to external factors such as temperature and humidity. Trace water vapor detection experiments verify that the measurement accuracy of the system can reach 1 ppmv for an optical path length of 10 cm.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (60977058&61475085), Science and technology development project of Shandong province (2014GGX101007), The Fundamental Research Funds of Shandong University (2014YQ011).

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Authors and Affiliations

  1. School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan, 250100, China

    Wei Wei, Jun Chang, Qingjie Huang, Cunguang Zhu, Qiang Wang, Zongliang Wang & Guangping Lv

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  1. Wei Wei
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  2. Jun Chang
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  3. Qingjie Huang
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  4. Cunguang Zhu
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  5. Qiang Wang
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  6. Zongliang Wang
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  7. Guangping Lv
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Correspondence to Jun Chang.

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Wei, W., Chang, J., Huang, Q. et al. Wavelength modulation spectroscopy with signal–reference beam method for highly sensitive gas detection. Appl. Phys. B 118, 75–83 (2015). https://doi.org/10.1007/s00340-014-5956-1

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  • DOI: https://doi.org/10.1007/s00340-014-5956-1

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