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Opt Express

Title:		Open-path multi-species remote sensing with a broadband optical parametric oscillator
Author(s):		Kara O; Sweeney F; Rutkauskas M; Farrell C; Leburn CG; Reid DT;
Address:
Journal Title:		Opt Express
Year:		2019
Volume:		27
Issue:		15
Page Number:		21358 - 21366
DOI:		10.1364/OE.27.021358
ISSN/ISBN:		1094-4087 (Electronic) 1094-4087 (Linking)
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-microm 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"
Keywords:
Notes:		"PubMed-not-MEDLINEKara, Oguzhan Sweeney, Frazer Rutkauskas, Marius Farrell, C Leburn, C G Reid, Derryck T eng 2019/09/13 Opt Express. 2019 Jul 22; 27(15):21358-21366. doi: 10.1364/OE.27.021358"