中国物理B ›› 2016, Vol. 25 ›› Issue (2): 24208-024208.doi: 10.1088/1674-1056/25/2/024208

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

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)   

  1. School of Physics and Electronics, Central South University, Changsha 410083, China
  • 收稿日期:2015-05-24 修回日期:2015-08-21 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: Bing-Chu Yang E-mail:bingchuyang@csu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61172047 and 61071025).

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)   

  1. School of Physics and Electronics, Central South University, Changsha 410083, China
  • Received:2015-05-24 Revised:2015-08-21 Online:2016-02-05 Published:2016-02-05
  • Contact: Bing-Chu Yang E-mail:bingchuyang@csu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61172047 and 61071025).

摘要: 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.

关键词: absorption spectroscopy, Fabry-Perot tunable filter, wavelength modulation, acetylene detection

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.

Key words: absorption spectroscopy, Fabry-Perot tunable filter, wavelength modulation, acetylene detection

中图分类号:  (Laser spectroscopy)

  • 42.62.Fi
42.79.-e (Optical elements, devices, and systems) 42.87.-d (Optical testing techniques)