Sub-ppm multi gas sensing based on photoacoustic spectroscopy using DFB laser diodes
نویسندگان
چکیده
Sensitive photoacoustic detection of methane (CH4), hydrogen chloride (HCl) and water vapour (H2O) in the near-infrared range using semiconductor DFB lasers is reported. A detection limit of 0.17 ppm of CH4, 0.2 ppm of HCl and 0.024 ppm of H2O (signal-to-noise ratio = 3) is reached using a properly designed photoacoustic cell operating in its first longitudinal mode.
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