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Self-calibration wavelength modulation spectroscopy for acetylene detection based on tunable diode laser absorption spectroscopy |
Qin-Bin Huang(黄秦斌), Xue-Mei Xu(许雪梅), Chen-Jing Li(李晨静), Yi-Peng Ding(丁一鹏), Can Cao(曹粲), Lin-Zi Yin(尹林子), Jia-Feng Ding(丁家峰) |
School of Physics and Electronics, Central South University, Changsha 410083, China |
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Abstract The expressions of the second harmonic (2f) signal are derived on the basis of absorption spectral and lock-in theories. A parametric study indicates that the phase shift between the intensity and wavelength modulation makes a great contribution to the 2f signal. A self-calibration wavelength modulation spectroscopy (WMS) method based on tunable diode laser absorption spectroscopy (TDLAS) is applied, combining the advantages of ambient pressure, temperature suppression, and phase-shift influences elimination. Species concentration is retrieved simultaneously from selected 2f signal pairs of measured and reference WMS-2f spectra. The absorption line of acetylene (C2H2) at 1530.36 nm near-infrared is selected to detect C2H2 concentrations in the range of 0-400 ppmv. System sensitivity, detection precision and limit are markedly improved, demonstrating that the self-calibration method has better detecting performance than the conventional WMS.
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Received: 09 March 2016
Revised: 16 May 2016
Accepted manuscript online:
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PACS:
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42.30.Rx
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(Phase retrieval)
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42.55.Px
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(Semiconductor lasers; laser diodes)
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42.79.-e
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(Optical elements, devices, and systems)
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42.87.-d
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(Optical testing techniques)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61172047, 61502538, and 61501525). |
Corresponding Authors:
Xue-Mei Xu
E-mail: xuxuemei999@126.com
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Cite this article:
Qin-Bin Huang(黄秦斌), Xue-Mei Xu(许雪梅), Chen-Jing Li(李晨静), Yi-Peng Ding(丁一鹏), Can Cao(曹粲), Lin-Zi Yin(尹林子), Jia-Feng Ding(丁家峰) Self-calibration wavelength modulation spectroscopy for acetylene detection based on tunable diode laser absorption spectroscopy 2016 Chin. Phys. B 25 114202
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