Measurement of ethylene in combustion exhaust using a 3.3-μm distributed feedback interband cascade laser with wavelength modulation spectroscopy
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A sensor for the detection of ethylene (C2H4) in combustion exhaust based on a mid-infrared wavelength modulation spectroscopic technique was constructed using a distributed feedback interband cascade laser (DFB-ICL) with a wavelength of 3.3 μm. The direct absorption spectrum of C2H4 in the range of 2978.8–2982.1 cm−1 was recorded, where the spectrum was in good agreement with the spectrum simulated using parameters from the HITRAN 2012 database. The absorption line at 2979.581 cm−1 [2.42 × 10−21 cm2 mol−1 cm−1, ν11, PP5(5)] was selected for C2H4 detection. This frequency was chosen to minimize spectral interference from other major combustion products in the emission frequency range of the DFB-ICL. A limit of detection for C2H4 of 96 parts per billion by volume was achieved at a signal-to-noise ratio of two under 3 kPa of pressure using 2f wavelength modulation spectroscopy. Using the developed sensor, the ethylene concentration in the exhaust from a portable power generator was also successfully determined.
The authors thank an anonymous reviewer to inform C2H6 absorption spectra. This study was partly supported by JSPS KAKENHI (Grant Numbers 16K18023 and 26288086) and by the Council for Science, Technology, and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Innovative Combustion Technology” (Funding agency: JST).
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