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Water vapor concentration detection based on QEPAS sensor

  • School of Energy Science and Engineering, Harbin Institute of Technology
  • Harbin Institute of Technology
  • Northeast Forestry University

Research output: Contribution to journalArticlepeer-review

Abstract

In this letter, a quartz-enhanced photoacoustic spectroscopy (QEPAS) based trace gas sensor using a quartz tuning fork (QTF) with resonant frequency of 40 kHz as the acoustic wave transducer was demonstrated for the first time. A 1.395 μm continuous wave (CW), fiber-coupled distributed feedback (DFB) diode laser was employed as the exciting source. Water vapor was selected as the target gas, and wavelength modulation spectroscopy (WMS) with 2nd harmonic detection was utilized. After optimization of the laser modulation depth, a minimum detection limit (MDL) of 139 ppmv was obtained.

Original languageEnglish
Pages (from-to)351-353
Number of pages3
JournalOptoelectronics and Advanced Materials, Rapid Communications
Volume10
Issue number5-6
StatePublished - 1 May 2016

Keywords

  • Quartz tuning fork
  • Quartz-enhanced photoacoustic spectroscopy
  • Resonant frequency
  • Water vapor

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