DOUBLE BEAM METHODS FOR FAR-INFRARED FOURIER ABSORPTION SPECTROSCOPY AND REFRACTOMETRY

Abstract

This communication will describe a far-infrared inteferometric Fourier spectrometer system which has been developed to operate in a double beam'' mode of scanning interferograms, in an effort to overcome the limitations in photometric accuracy which are inherent in any single beam'' spectroscopic instrument. The operational performance of this system and its application to far-infrared absorption spectroscopy and refractometry will be illustrated, and critically assessed with regard to reproducibility and photometric accuracy.