Abstract

Fast and reliable identification of liquids is of great importance in developing new security measures at public places. A concept of liquid identification is presented, based on our Hilbert spectroscopy and high-Tc Josephson junctions, that can operate at the frequency range of main dispersions of liquids under concern, i.e. at the intermediate range from microwaves to terahertz frequencies. Several demonstration setups, consisting of synthesized polychromatic radiation sources and compact Hilbert spectrometers integrated in Stirling coolers, have been developed and characterized. Reflection polychromatic spectra of various bottled liquids have been measured at the spectral range of 15 – 400 GHz with total scanning time down to 0.5 second and the possibility of reliable identification of liquids has been demonstrated.

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