A time domain reflectometer for dielectric relaxation spectroscopy of electrolyte solutions

Abstract

A time domain reflectometer for dielec. relaxation spectroscopy of electrolyte solns. at -45 to 90° is presented. With a set of cutoff cells differing in their cell consts., pure solvents covering the permittivity range of 7 ≤ ε ≤ 228 and their concd. electrolyte solns. (κ > 1 Ω-1 m-1) can be investigated at frequencies of 0.05 ≤ ν/GHz ≤ 9. In combination with the transmission line system of our lab. (8.5 ≤ ν/GHz ≤ 89) dielec. dispersion, ε'(ν), and total loss, η''(ν) = ε''(ν) + κ/(2πνε0) can be detd. with 2% accuracy relative to ε.