Abstract
A dual beam interferometer with two inputs and two outputs is described. The instrument allows measurements of difference reflectivities in the far infrared region (10...500 cm−1). In the high vacuum compartment cryogenic equioment, like a superconducting magnet or a cryoflow cryostat can be installed. However the step scan version of the interferometer is sensitive to any fluctuation of source intensity, base-line shift in the interferogram and thermal distortions, effects causing scintillation noise in the spectra. A method is described which suppresses scintillation noise by additional chopping at the output of the interferometer and rationing digitally difference and sum interferograms. These are acquired by phase sensitive detection with two lock ins.
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