Ethylene trace detection by quartz enhanced photoacoustic spectroscopy

Ethylene (C
2
H
4
) absorption line intensity at 6172.95 cm
⁻¹
was determined for trace gas detection. C
2
H
4
trace concentration measurements were performed using quartz enhanced photoacoustic spectroscopy (QEPAS) with a sensitivity of 1.3 ppmv (1σ) for τ=1s time constant. The effect of modulation frequency accuracy on QEPAS signal was investigated.