High-temperature measurements of methane and acetylene using quantum cascade laser absorption near 8μm

Muhammad Bilal Sajid, Tamour Javed, Aamir Farooq

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The mid-infrared wavelength region near 8 mu m contains absorption bands of several molecules such as water vapor, hydrogen peroxide, nitrous oxide, methane and acetylene. A new laser absorption sensor based on the v(4) band of methane and the v(4)+v(5) band of acetylene is reported for interference-free, time-resolved measurements under combustion-relevant conditions. A detailed line-selection procedure was used to identify optimum transitions. Methane and acetylene were measured at the line centers of Q12 (1303.5 cm(-1)) and P23 (1275.5 cm(-1)) transitions, respectively. High-temperature absorption cross sections of methane and acetylene were measured at peaks (on-line) and valleys (off-line) of the selected absorption transitions. The differential absorption strategy was employed to eliminate interference absorption from large hydrocarbons. Experiments were performed behind reflected shock waves over a temperature range of 1200-2200 K, between pressures of 1-4 atm. The diagnostics were then applied to measure the respective species time-history profiles during the shock-heated pyrolysis of n-pentane. (C) 2015 Elsevier Ltd. All rights reserved.
Original languageEnglish (US)
Pages (from-to)66-74
Number of pages9
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume155
DOIs
StatePublished - Apr 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST) and by Saudi Aramco under the FUELCOM Program.

Fingerprint

Dive into the research topics of 'High-temperature measurements of methane and acetylene using quantum cascade laser absorption near 8μm'. Together they form a unique fingerprint.

Cite this