Permittivity of ice at radio frequencies

• Verfasst von: Bohleber, Pascal [VerfasserIn]
• Verfasst von: Wagner, Norman [VerfasserIn]
• Verfasst von: Eisen, Olaf [VerfasserIn]
• Titel: Permittivity of ice at radio frequencies
• Titelzusatz: Part I. Coaxial transmission line cell
• Verf.angabe: P. Bohleber, N. Wagner, O. Eisen
• Umfang: 12 S.
• Fussnoten: Gesehen am 05.10.2018
• Titel Quelle: Enthalten in: Cold regions science and technology
• Jahr Quelle: 2012
• Band/Heft Quelle: 82(2012), S. 56-67
• DOI: doi:10.1016/j.coldregions.2012.05.011
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1581579977

Abstract

At radio-frequencies, measurements of the permittivity of ice are sparse and with unknown or large uncertainty. Coaxial transmission lines have been established for frequency-dependent permittivity determination for a broad variety of materials. Here we present a coaxial transmission line setup originally designed for soil samples, now adapted for measuring ice samples between 10MHz and 1.5GHz. Measured scattering parameters are assessed for artifacts against a forward calculation based on transmission line theory. A Debye-type relaxation function for the complex permittivity is assumed to obtain the permittivity of ice from the measured full set of four scattering parameters by means of a genetic optimization algorithm. The algorithm is successfully validated against quasi-analytical and iterative computation techniques with reference measurements of a low-loss Teflon standard. Based on the forward calculation and the Teflon standard, the total uncertainty for measuring the real part of the permittivity is estimated to be around 1%. Additional measurements of reference materials air, water, ethanol and methanol are used for validation. The real part of the permittivity of eight artificial pure ice samples is found frequency-independent between 10MHz and 1.5GHz at −20°C, with a mean value of 3.18±0.01.