M Lyatti et al 2009 Supercond. Sci. Technol. 22 114005 doi:10.1088/0953-2048/22/11/114005
M Lyatti, Y Divin, U Poppe and K Urban
Show affiliationsFast and reliable identification of liquids is of great importance in, for example, security, biology and the beverage industry. An unambiguous identification of liquids can be made by electromagnetic measurements of their dielectric functions in the frequency range of their main dispersions, but this frequency range, from a few GHz to a few THz, is not covered by any conventional spectroscopy. We have developed a concept of liquid identification based on our new Hilbert spectroscopy and high- Tc Josephson junctions, which can operate at the intermediate range from microwaves to THz frequencies. A demonstration setup has been developed consisting of a polychromatic radiation source and a compact Hilbert spectrometer integrated in a Stirling cryocooler. Reflection polychromatic spectra of various bottled liquids have been measured at the spectral range of 15–300 GHz with total scanning time down to 0.2 s and identification of liquids has been demonstrated.
77.22.Ch Permittivity (dielectric function)
74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects
Issue 11 (November 2009)
Received 17 July 2009, in final form 20 August 2009
Published 20 October 2009
M Lyatti et al 2009 Supercond. Sci. Technol. 22 114005
Elisabeth Cardis et al 2006 J. Radiol. Prot. 26 127
A S van de Nes et al 2006 Rep. Prog. Phys. 69 2323
Z L Yuan et al 2009 New J. Phys. 11 045019
Matthew R Maschmann et al 2006 Nanotechnology 17 3925
Q. D. Wang et al. 2005 ApJ 635 386
Dora A Napolitano and Aliya S S Ryan 2007 Environ. Res. Lett. 2 045005
V Appapillai and A W Mailvaganam 1950 Proc. Phys. Soc. A 63 856
A W Mailvaganam 1946 Proc. Phys. Soc. 58 468
A Rathke 2005 New J. Phys. 7 127