Zeitschrift fur Naturforschung, Teil A (Physik, Physikalische Chemie, Kosmophysik) (May 1990) vol.45A, no.5, p.677-86. 25 refs.

High precision measurements of the permittivity of water in the microwave range.

Steinhoff HJ, Redhardt A, Lieutenant K, Chrost W, Hess G, Schlitter J, Neumann HJ Institut fur Biophysik, Ruhr-Universitat Bochum, F.R.G.

A practical version of a homodyne method for measuring the complex permittivity of high loss liquids at 3 and 9 GHz is described. The systematic errors are discussed in detail, because the homodyne method seems to be suitable as a simple standard method for precise measurements. The results of measurements on water in the temperature range 6 degrees C-45 degrees C are presented. The determination of all five parameters of the Debye function is possible. Finally, accuracy limiting factors for the determination of the relaxation parameters are discussed in detail.