A QEPAS based methane sensor with a 2.35 μm antimonide laser
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- Jahjah, M., Vicet, A. & Rouillard, Y. Appl. Phys. B (2012) 106: 483. doi:10.1007/s00340-011-4671-4
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A methane sensor based on quartz-enhanced photoacoustic spectroscopy was developed. An antimonide quantum-well diode laser was used as an excitation source. The GaInAsSb/AlGaAsSb laser was fabricated by molecular beam epitaxy on GaSb substrate. This diode laser emits in the 2.35 μm range at room temperature in the continuous wave regime. A spectrophone constituted of a quartz tuning fork and two steel microresonators was used. The analysis of the sensor response with one, two or without microresonators is presented. Second derivative wavelength modulation detection was used to perform low concentrations measurements, thus we obtained a CH4 detection limit of 1 ppmv.