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QCL-Based Dual-Comb Spectrometer for Multi-Species Measurements at High Temperatures and High Pressures

1
Clean Combustion Research Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
2
IRsweep AG, Laubisruetistr. 44, 8712 Staefa, Switzerland
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(12), 3602; https://doi.org/10.3390/s20123602
Received: 14 May 2020 / Revised: 19 June 2020 / Accepted: 24 June 2020 / Published: 26 June 2020
(This article belongs to the Section Optical Sensors)
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−1). 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. View Full-Text
Keywords: dual-frequency combs; mid-infrared absorption spectroscopy; chemical kinetics; shock tube dual-frequency combs; mid-infrared absorption spectroscopy; chemical kinetics; shock tube
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Zhang, G.; Horvath, R.; Liu, D.; Geiser, M.; Farooq, A. QCL-Based Dual-Comb Spectrometer for Multi-Species Measurements at High Temperatures and High Pressures. Sensors 2020, 20, 3602.

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