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Intra-pulse Cavity Enhanced Measurements of Carbon Monoxide in a Rapid Compression Machine

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Abstract

A laser absorption sensor for carbon monoxide concentration was developed for combustion studies in a rapid compression machine using a pulsed quantum cascade laser near 4.89 μm. Cavity enhancement reduced minimum detection limit down to 2.4 ppm at combustion relevant conditions. Off-axis alignment and rapid intra-pulse down-chirp resulted in effective suppression of cavity noise.

© 2018 The Author(s)

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