Dielectric detection by an electromagnetic cavity method

James C. Weatherall; Howard F. Beckley; Joseph A. Gatto

doi:10.1117/12.542901

15 September 2004 Dielectric detection by an electromagnetic cavity method

James C. Weatherall, Howard F. Beckley, Joseph A. Gatto

Proceedings Volume 5403, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense III; (2004) https://doi.org/10.1117/12.542901
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

A method to screen for flammable and explosive materials in bottles by electromagnetic measurement is described. The technique makes use of an aluminum cavity having strong electromagnetic resonances in the radio wave band. An object inserted into the cavity changes the internal field configuration, and causes small, but measurable shifts in the resonant frequencies. The response depends on the electrical permittivity, or dielectric constant, of the material. By measuring the frequency change of many different cavity modes, the dielectric constant of the perturbing object can be inferred independently of the object's size and shape. We demonstrate the detection of materials in bottles using an experimental device.

Citation Download Citation

James C. Weatherall, Howard F. Beckley, and Joseph A. Gatto "Dielectric detection by an electromagnetic cavity method", Proc. SPIE 5403, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense III, (15 September 2004); https://doi.org/10.1117/12.542901

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