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Fourier-transform spectroscopy using a femtosecond optical parametric oscillator is demonstrated. Specifically, this system is used to detect a thiodiglycol droplet from concrete and aluminum surfaces and atmospheric water vapor at a 2-m stand-off distance.
A quantum cascade laser (QCL) absorption sensor system operating at 7.83 µm was developed for simultaneous dual-species monitoring of CH4 and N2O using a novel compact multipass gas absorption cell with a sampling volume of 225 mL.
A molecular detection method based on laser dispersion spectroscopy has been implemented to detect methane concentrations with an open-path configuration and using transitions from the ν4 band. Preliminary results on transient seeps are presented.
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