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  • Received: May. 14, 2007

    Accepted: --

    Posted: Nov. 14, 2007

    Published Online: Nov. 14, 2007

    The Author Email: Wang Zhang (yuqx@dlut.edu.cn)

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    Wang Zhang, Zhiying Wu, Qingxu Yu. Photoacoustic spectroscopy for fast and sensitive ammonia detection[J]. Chinese Optics Letters, 2007, 5(11): 677

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Chinese Optics Letters, Vol. 5, Issue 11, 677 (2007)

Photoacoustic spectroscopy for fast and sensitive ammonia detection

Wang Zhang1,*, Zhiying Wu1, and Qingxu Yu2

Author Affiliations

  • 1School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023
  • 2Informational Engineering Department, Environmental Management College of China, Qinhuangdao 066004

Abstract

A photoacoustic (PA) spectrometer with H-type first longitudinal resonant cells for ammonia detection is developed. A new PA cell structure is designed to accelerate the drift velocity of the sample gas near the cell surface, so that the short response time at the flow rate of 100 sccm (standard cubic centimeter per minute) is achieved. The response time of 5 min and detection limit of 0.86 ppbv is reached for ammonia concentration measurement with a Teflon polytetrafluoroethylene (PTFE) cell. Further improvement could be expected when using a brass cell with a high quality Teflon fluorinated ethylene propylene (FEP) coating.

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