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- W2746255890 abstract "We demonstrate standoff detection of turbulent mixed-chemical plumes using a broadly tunable external cavity quantum cascade laser (ECQCL). The ECQCL was directed through plumes of mixed methanol/ethanol vapor to a partially reflective surface located 10 m away. The reflected power was measured as the ECQCL was swept over its tuning range of 930 to 1065 cm−1 (9.4 to 10.8 μm) at rates up to 200 Hz. Analysis of the transmission spectra though the plume was performed to determine chemical concentrations with a time resolution of 0.005 s. Comparison of multiple spectral sweep rates of 2, 20, and 200 Hz shows that higher sweep rates reduce effects of atmospheric and source turbulence, resulting in lower detection noise and more accurate measurement of the rapidly changing chemical concentrations. Detection sensitivities of 0.13 ppm*m for MeOH and 1.2 ppm*m for EtOH are demonstrated for a 200-Hz spectral sweep rate and normalized to a 1-s detection time." @default.
- W2746255890 created "2017-08-31" @default.
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- W2746255890 date "2017-08-21" @default.
- W2746255890 modified "2023-09-27" @default.
- W2746255890 title "Standoff detection of turbulent chemical mixture plumes using a swept external cavity quantum cascade laser" @default.
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- W2746255890 doi "https://doi.org/10.1117/1.oe.57.1.011003" @default.
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