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Double Beam Fourier Spectroscopy with Interferometric Background Compensation

Double-beam spectroscopy for ratioing is not as easily achieved in Fourier interferometry as it is in conventional slit spectroscopy because the ratioing has to be done in the recovered spectrum and not in the interferogram. But double-beam differencing spectroscopy can be done successfully in the interferogram domaine of Fourier spectroscopy [1-10]. Such a technique is especially useful if a sample shows only small variations in absorptivity or reflectivity compared to a refence standard.