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- W2960232297 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." @default.
- W2960232297 created "2019-07-23" @default.
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- W2960232297 date "2019-07-16" @default.
- W2960232297 modified "2023-10-11" @default.
- W2960232297 title "Open-path multi-species remote sensing with a broadband optical parametric oscillator" @default.
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- W2960232297 doi "https://doi.org/10.1364/oe.27.021358" @default.
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