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      Compact quantum cascade laser based quartz-enhanced photoacoustic spectroscopy sensor system for detection of carbon disulfide.

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      Optics express

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          Abstract

          A compact gas sensor system based on quartz-enhanced photoacoustic spectroscopy (QEPAS) employing a continuous wave (CW) distributed feedback quantum cascade laser (DFB-QCL) operating at 4.59 µm was developed for detection of carbon disulfide (CS<sub>2</sub>) in air at trace concentration. The influence of water vapor on monitored QEPAS signal was investigated to enable compensation of this dependence by independent moisture sensing. A 1 σ limit of detection of 28 parts per billion by volume (ppbv) for a 1 s lock-in amplifier time constant was obtained for the CS<sub>2</sub> line centered at 2178.69 cm<sup>-1</sup> when the gas sample was moisturized with 2.3 vol% H<sub>2</sub>O. The work reports the suitability of the system for monitoring CS<sub>2</sub> with high selectivity and sensitivity, as well as low sample gas volume requirements and fast sensor response for applications such as workplace air and process monitoring at industry.

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          Author and article information

          Journal
          Opt Express
          Optics express
          1094-4087
          1094-4087
          Mar 21 2016
          : 24
          : 6
          Article
          338238
          27136846

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