Microwave dielectric response of nonspherical particles by modulation techniques.
Fritz, Gerald Wayne.
Tolles, William M.
Schacher, Gordon E.
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A method was developed to investigate the dielectric response of non-spherical zinc oxide particles in a gaseous suspension. The method exploited a change in a microwave cavity resonance when the particles were aligned with respect to the microwave electric field. To enhance the detectability of this change, modulation techniques were employed for alignment and detection purposes. A theory was devised to explain this method and experiments were conducted, the results of which support this theory. Investigations with the zinc oxide particles produced in these experiments indicated that the particle response demonstrated saturation and that the particles are easily aligned in an electric field strength of several hundred Volts/cm. The zinc oxide particles produced showed a relaxation frequency of approximately 56 Hz and ranged in size from approximately 2.0 to 3.5 microns in length.
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