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Use of a microwave cavity for sensing dielectric properties of arbitrarily shaped biological objects

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3 Author(s)
Kraszewski, A.W. ; US Dept. of Agric., Athens, GA, USA ; Nelson, S.O. ; You, T.-S.

A rectangular waveguide resonator operating in the H105 mode at 3.2 GHz is used in determining the change in resonant frequency, ΔF, and the Q factor of the cavity, ΔT , when measured with and without single corn kernels of various shapes and dimensions. By measuring those variables for a kernel oriented in two positions differing by a 90° rotation with respect to the maximum E-field vector, the average values of ΔF and ΔT are found to be independent of shape. The ratio ΔFT is independent of size and is a function of the material properties (ε'-1)/ε". This function is shown to be related to the material density, moisture content, or other characteristics when all other properties except the one selected remain unchanged

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:38 ,  Issue: 7 )

Date of Publication:

Jul 1990

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