Zhang Guangle, Horvath Raphael, Liu Dapeng, Geiser Markus, Farooq Aamir
Clean Combustion Research Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia.
IRsweep AG, Laubisruetistr. 44, 8712 Staefa, Switzerland.
Sensors (Basel). 2020 Jun 26;20(12):3602. doi: 10.3390/s20123602.
Rapid multi-species sensing is an overarching goal in time-resolved studies of chemical kinetics. Most current laser sources cannot achieve this goal due to their narrow spectral coverage and/or slow wavelength scanning. In this work, a novel mid-IR dual-comb spectrometer is utilized for chemical kinetic investigations. The spectrometer is based on two quantum cascade laser frequency combs and provides rapid (4 µs) measurements over a wide spectral range (~1175-1235 cm). Here, the spectrometer was applied to make time-resolved absorption measurements of methane, acetone, propene, and propyne at high temperatures (>1000 K) and high pressures (>5 bar) in a shock tube. Such a spectrometer will be of high value in chemical kinetic studies of future fuels.
快速多物种传感是化学动力学时间分辨研究的一个总体目标。由于目前大多数激光源的光谱覆盖范围窄和/或波长扫描速度慢，无法实现这一目标。在这项工作中，一种新型的中红外双梳状光谱仪被用于化学动力学研究。该光谱仪基于两个量子级联激光频率梳，可在宽光谱范围（约1175 - 1235厘米）内进行快速（4微秒）测量。在此，该光谱仪被应用于在激波管中对高温（>1000 K）和高压（>5巴）下的甲烷、丙酮、丙烯和丙炔进行时间分辨吸收测量。这样的光谱仪在未来燃料的化学动力学研究中将具有很高的价值。
