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>New method for very sensitive dielectric difference measurements on highhyphen;loss liquids at microwave frequencies
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New method for very sensitive dielectric difference measurements on highhyphen;loss liquids at microwave frequencies
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机译：New method for very sensitive dielectric difference measurements on highhyphen;loss liquids at microwave frequencies
A microwave system for very sensitive dielectric measurements on highhyphen;loss liquids over the frequency range 8ndash;26.5 GHz is described which depends on the cavity resonance perturbation method. Equations for the resonance perturbation by a thin capillary in cylindrical as well as in rectangular cavities are derived, demonstrating the dependence of the real and imaginary part of egr; on both the resonance frequency shift and the change in resonance width of the cavity. The microwave generator with high frequency stability (1 part in 108) is frequency modulated at one or two frequencies. The use of phase sensitive detection allows egr; measurements on water to within 1percnt;, as well as dielectric difference measurements on aqueous solutions to within 0.005 in Dgr;egr;prime; and Dgr;egr;Prime;(1 part in 104or better). Details of cavity constructions are given and some measurements on water and on dilute aqueous solutions are reported.
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