Open-path multi-species remote sensing with a broadband optical parametric oscillator

Oguzhan Kara, Frazer Sweeney, Marius Rutkauskas, Carl Farrell, Christopher G. Leburn, Derryck Telford Reid

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Abstract

Open-path remote sensing is critical for monitoring fugitive emissions from industrial sites, where a variety of volatile organic compounds may be released. At ranges of only a few tens of metres, spatially coherent broadband mid-infrared sources can access sufficiently large absorption cross-sections to quantify hydrocarbon gas fluctuations above ambient background levels at high signal:noise ratios. Here we report path-integrated simultaneous concentration measurements of water, methane and ethane implemented in the 3.1–3.5-µm range using 0.05-cm−1-resolution Fourier-transform spectroscopy with an ultrafast optical parametric oscillator and a simple, non-compliant target. Real-time concentration changes were observed at a range of 70 m by simulating a fugitive emission with a weak localized release of 2% methane in air. Spectral averaging yielded a methane detection sensitivity of 595 ppb·m, implying a system capability to resolve few-ppb concentrations of many volatile organic compounds at observation ranges of 50–100 m.
Original languageEnglish
Pages (from-to)21358-21366
Number of pages9
JournalOptics Express
Volume27
Issue number15
Early online date16 Jul 2019
DOIs
Publication statusPublished - 22 Jul 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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