A high-sensitivity, near-infrared tunable-diode-laser-based photoacoustic water-vapour-detection system for automated operation

Zoltán Bozókl, János Sneider, Zoltán Gingl, Árpád Mohácsi, Miklós Szakéll, Zsolt Bor, Gábor Szabó

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Abstract

A photoacoustic sensor system for automatic detection of low concentrations of water vapour is described in this paper. A Littman-configuration external-cavity diode laser operating at 1125 nm was used as a light source in combination with a high-sensitivity measuring photoacoustic cell, a reference photoacoustic cell and PC-controlled electronics. The system was calibrated with synthetic gas samples and a detection limit of 13 μmol per mol of water vapour was determined. Adsorption/desorption phenomena at the walls of the measuring photoacoustic cell were found to be an important limiting factor for the sensitivity of the system.

Original languageEnglish
Pages (from-to)999-1003
Number of pages5
JournalMeasurement Science and Technology
Volume10
Issue number11
DOIs
Publication statusPublished - Nov 1999

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Keywords

  • Diode laser
  • Photoacoustic spectroscopy
  • Water vapour

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics

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