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International Journal of Thermophysics

, Volume 36, Issue 5–6, pp 1116–1122 | Cite as

All-Optical Cantilever-Enhanced Photoacoustic Spectroscopy in the Open Environment

  • Wei Wei
  • Yong Zhu
  • Cheng Lin
  • Li Tian
  • Zhuwen Xu
  • Jinpeng Nong
Article

Abstract

A novel all-optical cantilever-enhanced photoacoustic spectroscopy technique for trace gas detection in the open environment is proposed. A cantilever is set off-beam to “listen to” the photoacoustic signal, and an improved quadrature-point stabilization Fabry–Perot demodulation unit is used to pick up the vibration signal of the acoustic transducer instead of a complicated Michelson interferometer. The structure parameters of the cantilever are optimized to make the sensing system work more stably and reliably using a finite element method, which is then fabricated by surface micro-machining technology. Finally, related experiments are carried out to detect the absorption of water vapor at one atmosphere in the open environment. It was found that the normalized noise-equivalent absorption coefficient obtained by a traditional Fabry–Perot demodulation unit is \(3.38 \times 10^{-7}\,\hbox {cm}^{-1}\cdot \hbox {W}\cdot \hbox {Hz}^{-1/2}\), while that by a quadrature- point stabilization Fabry–Perot demodulation unit is \(1.08 \times 10^{-7}\,\hbox {cm}^{-1}\cdot \hbox {W}\cdot \hbox {Hz}^{-1/2}\), which indicates that the sensitivity is increased by a factor of 3.1 using improved cantilever-enhanced photoacoustic spectroscopy.

Keywords

Cantilever Optical fiber Fabry–Perot Photoacoustic spectroscopy Trace gas detection 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 61405021), Specialized Research Fund for the Doctoral Program of Higher Education (No. 20120191120021), Natural Science Foundation of Chongqing, China (cstc2014jcyjA40045), and the Fundamental Research Funds for the Central Universities (No. 106112013CDJZR120006 and No. CDJZR12120004).

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Wei Wei
    • 1
    • 2
  • Yong Zhu
    • 1
    • 2
  • Cheng Lin
    • 1
    • 2
  • Li Tian
    • 2
  • Zhuwen Xu
    • 2
  • Jinpeng Nong
    • 2
  1. 1.Key Laboratory of Optoelectronic Technology & SystemMinistry of Education of China, Chongqing UniversityChongqingChina
  2. 2.Optoelectronic Engineering College of Chongqing UniversityChongqingChina

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