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- W2583670505 abstract "Ethylene (C 2 H 4 ) was detected using quartz-enhanced photoacoustic spectroscopy (QEPAS) at 10.5 µm with a continuous wave, distributed-feedback quantum cascade laser as the light source. The QEPAS sensor was operated at low pressures (≤200 torr) to eliminate the cross-talk spectral interference between C 2 H 4 and CO 2 , a major interfering species in practical applications. The sensor was calibrated to show a good linear response to C 2 H 4 concentration and the Allan deviation analysis demonstrated a minimum detection limit of 8 ppb at an integration time of 90 s. Although no spectral overlap between C 2 H 4 and CO 2 was confirmed at the pressure ≤200 torr by the direct absorption measurement using a 28-m multipass cell, we observed the apparent influence of the CO 2 addition to the C 2 H 4 /N 2 mixture on the photoacoustic signal of C 2 H 4 . An energy transfer model involving the vibration–vibration (VV) and vibration–translation (VT) transitions in the C 2 H 4 –CO 2 –N 2 system was constructed to interpret the experimental data. Additionally, the vibrational relaxation times of C 2 H 4 were obtained based on the QEPAS technique and the energy transfer model, which were in good agreement with the previous studies." @default.
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- W2583670505 date "2017-02-01" @default.
- W2583670505 modified "2023-09-24" @default.
- W2583670505 title "Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) Detection of the ν<sub>7</sub> Band of Ethylene at Low Pressure with CO<sub>2</sub> Interference Analysis" @default.
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- W2583670505 doi "https://doi.org/10.1177/0003702817690406" @default.
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