title: Investigation of aqueous alcohol and sugar solutions with reflection terahertz time-domain spectroscopy.
abstract: We give a detailed analysis of a general realization of reflection terahertz time-domain spectroscopy. The method is self-referenced and applicable at all incidence angles and for all polarizations of the incident terahertz radiation. Hence it is a general method for the determination of the dielectric properties of especially liquids in environments where transmission measurements are difficult. We investigate the dielectric properties in the 0.1-1.0 THz frequency range of liquids using reflection terahertz time-domain spectroscopy. We apply the technique for the determination of alcohol and sugar concentration of commercial alcoholic beverages and liquors. The special geometry of the experiment allows measurement on sparkling beverages.
authors: Peter Uhd
authors: PU
authors: Jepsen
authors: Uffe
authors: U
authors: Møller
authors: Hannes
authors: H
authors: Merbold