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Wavelength modulation spectroscopy at 1530.32 nm for measurements of acetylene based on Fabry-Perot tunable filter |
Yun-Long Li(李运龙), Bing-Chu Yang(杨兵初), Xue-Mei Xu(许雪梅) |
School of Physics and Electronics, Central South University, Changsha 410083, China |
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Abstract Sensitive detection of acetylene (C2H2) is performed by absorption spectroscopy and wavelength modulation spectroscopy (WMS) based on Fiber Fabry-Perot tunable filter (FFP-TF) at 1530.32 nm. After being calibrated by Fiber Bragg Grating (FBG), FFP-TF is frequency-multiplexed and modulated at 20 Hz and 2.5 kHz respectively to achieve wavelength modulation. The linearity with 0.9907 fitting coefficient is obtained by measuring different concentrations in a 100 ppmv-400 ppmv range. Furthermore, the stability of the system is analyzed by detecting 50 ppmv and 100 ppmv standard gases for 2 h under room temperature and ambient pressure conditions respectively. The precision of 11 ppmv is achieved by calculating the standard deviation. Therefore, the measuring system of C2H2 detection can be applied in practical applications.
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Received: 24 May 2015
Revised: 21 August 2015
Accepted manuscript online:
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PACS:
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42.62.Fi
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(Laser spectroscopy)
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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 and 61071025). |
Corresponding Authors:
Bing-Chu Yang
E-mail: bingchuyang@csu.edu.cn
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Cite this article:
Yun-Long Li(李运龙), Bing-Chu Yang(杨兵初), Xue-Mei Xu(许雪梅) Wavelength modulation spectroscopy at 1530.32 nm for measurements of acetylene based on Fabry-Perot tunable filter 2016 Chin. Phys. B 25 024208
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