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

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 impro...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2015-01, Vol.118 (1), p.75-83
Main Authors: Wei, Wei, Chang, Jun, Huang, Qingjie, Zhu, Cunguang, Wang, Qiang, Wang, Zongliang, Lv, Guangping
Format: Article
Language:English
Subjects:
Beams (radiation)
Engineering
Humidity
Lasers
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Scanning
Signal to noise ratio
Spectroscopy
Water vapor
Wavelength modulation
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Summary: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.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-014-5956-1