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Beat frequency quartz-enhanced photoacoustic spectroscopy for fast and calibration-free continuous trace-gas monitoring

Author

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  • Hongpeng Wu

    (State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University
    Collaborative Innovation Center of Extreme Optics, Shanxi University
    Rice University)

  • Lei Dong

    (State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University
    Collaborative Innovation Center of Extreme Optics, Shanxi University)

  • Huadan Zheng

    (State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University
    Collaborative Innovation Center of Extreme Optics, Shanxi University
    Rice University)

  • Yajun Yu

    (Rice University)

  • Weiguang Ma

    (State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University
    Collaborative Innovation Center of Extreme Optics, Shanxi University)

  • Lei Zhang

    (State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University
    Collaborative Innovation Center of Extreme Optics, Shanxi University)

  • Wangbao Yin

    (State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University
    Collaborative Innovation Center of Extreme Optics, Shanxi University)

  • Liantuan Xiao

    (State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University
    Collaborative Innovation Center of Extreme Optics, Shanxi University)

  • Suotang Jia

    (State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University
    Collaborative Innovation Center of Extreme Optics, Shanxi University)

  • Frank K. Tittel

    (Rice University)

Abstract

Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a sensitive gas detection technique which requires frequent calibration and has a long response time. Here we report beat frequency (BF) QEPAS that can be used for ultra-sensitive calibration-free trace-gas detection and fast spectral scan applications. The resonance frequency and Q-factor of the quartz tuning fork (QTF) as well as the trace-gas concentration can be obtained simultaneously by detecting the beat frequency signal generated when the transient response signal of the QTF is demodulated at its non-resonance frequency. Hence, BF-QEPAS avoids a calibration process and permits continuous monitoring of a targeted trace gas. Three semiconductor lasers were selected as the excitation source to verify the performance of the BF-QEPAS technique. The BF-QEPAS method is capable of measuring lower trace-gas concentration levels with shorter averaging times as compared to conventional PAS and QEPAS techniques and determines the electrical QTF parameters precisely.

Suggested Citation

  • Hongpeng Wu & Lei Dong & Huadan Zheng & Yajun Yu & Weiguang Ma & Lei Zhang & Wangbao Yin & Liantuan Xiao & Suotang Jia & Frank K. Tittel, 2017. "Beat frequency quartz-enhanced photoacoustic spectroscopy for fast and calibration-free continuous trace-gas monitoring," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15331
    DOI: 10.1038/ncomms15331
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