Intra-pulse laser absorption sensor with cavity enhancement for oxidation experiments in a rapid compression machine

Ehson Fawad Nasir, Aamir Farooq

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A sensor based on a mid-IR pulsed quantum cascade laser (QCL) and off-axis cavity enhanced absorption spectroscopy (OA-CEAS) has been developed for highly sensitive concentration measurements of carbon monoxide (CO) in a rapid compression machine. The duty cycle and the pulse repetition rate of the laser were optimized for increased tuning range, high chirp rate, and small line width to achieve effective laser-cavity coupling. This enabled spectrally resolved CO line-shape measurements at high pressures (P ~10 bar). A gain factor of 133 and a time resolution of 10 μs were demonstrated. CO concentration-time profiles during the oxidation of highly dilute n-octane/air mixtures were recorded, illustrating new opportunities in RCM experiments for chemical kinetics.
Original languageEnglish (US)
Pages (from-to)14601
JournalOptics Express
Volume26
Issue number11
DOIs
StatePublished - May 23 2018

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