Fourier-transform interferometer used for acquiring the OPO idler and laser interferograms.
(a) Interferogram recorded after the methane cell and (b) the calibration laser interferogram. The insets show the fringes across a range in the center of the data set.
Superposition of idler spectra recorded before and after the methane gas cell for idler center wavelengths of (a) , (b) , and (c) .
(a) Methane transmission spectrum constructed from six individual spectral transmission measurements and (b) the EPA calculated methane spectrum with (inset) longer wavelength absorption features shown magnified 50 times.
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