[Zurück]

J.P. Waclawek, H. Moser, B. Lendl:
"Compact quantum cascade laser based quartz-enhanced photoacoustic spectroscopy sensor system for detection of carbon disulfide";
Optics Express, 24 (2016), 6; S. 6559 - 6571.

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 (CS2) 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 CS2 line centered at 2178.69 cm−1 when the gas sample was moisturized with 2.3 vol% H2O. The work reports the suitability of the system for monitoring CS2 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.

Semiconductor lasers, quantum cascade; Spectroscopy, infrared; Optical sensing and sensors; Photoacoustics

http://dx.doi.org/10.1364/OE.24.006559

http://publik.tuwien.ac.at/files/publik_255948.pdf