, Volume 107, Issue 2, pp 459-467
Date: 12 May 2012

Compact QEPAS sensor for trace methane and ammonia detection in impure hydrogen

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A compact two-gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) was developed for trace methane and ammonia quantification in impure hydrogen. The sensor is equipped with a micro-resonator to confine the sound wave and enhance QEPAS signal. The normalized noise-equivalent absorption coefficients (1σ) of 2.45×10−8 cm−1 W/ \(\sqrt{}\) Hz and 9.1×10−9 cm−1 W/ \(\sqrt{}\) Hz for CH4 detection at 200 Torr and NH3 detection at 50 Torr were demonstrated with the QEPAS sensor configuration, respectively. The influence of water vapor on the CH4 channel was also investigated.