中国物理B ›› 2016, Vol. 25 ›› Issue (11): 114202-114202.doi: 10.1088/1674-1056/25/11/114202

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

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)   

  1. School of Physics and Electronics, Central South University, Changsha 410083, China
  • 收稿日期:2016-03-09 修回日期:2016-05-16 出版日期:2016-11-05 发布日期:2016-11-05
  • 通讯作者: Xue-Mei Xu E-mail:xuxuemei999@126.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61172047, 61502538, and 61501525).

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)   

  1. School of Physics and Electronics, Central South University, Changsha 410083, China
  • Received:2016-03-09 Revised:2016-05-16 Online:2016-11-05 Published:2016-11-05
  • Contact: Xue-Mei Xu E-mail:xuxuemei999@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61172047, 61502538, and 61501525).

摘要: 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.

关键词: wavelength modulation spectroscopy, phase shift, self-calibration method, acetylene detection

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.

Key words: wavelength modulation spectroscopy, phase shift, self-calibration method, acetylene detection

中图分类号:  (Phase retrieval)

  • 42.30.Rx
42.55.Px (Semiconductor lasers; laser diodes) 42.79.-e (Optical elements, devices, and systems) 42.87.-d (Optical testing techniques)