The microwave measurement of the conductivity of a small fiber with an open cavity

Author

Sagnard, Florence ; Berthault, André ; Véron, Bernard

Author_Institution

ONERA, Chatillon, France

Volume

49

Issue

5

fYear

2000

fDate

10/1/2000 12:00:00 AM

Firstpage

942

Lastpage

948

Abstract

An original method of determining the electric conductivity of spheroidal inclusions of the order of a few microns is described. The measurements are made in an open cavity at microwave frequencies. In order to produce sufficient perturbations inside the cavity, a composite made up of dielectric and conductive media had to be designed. By combining the model of the dielectric properties of the composite with the model of the operating conditions of the open cavity, we show that it is possible to determine the conductivity of a unique inclusion by using an analytical expression. Measurements are presented which concern a type of carbon fiber with several micrometers diameter and a few millimeters length. The results obtained for different samples validate the method; they can be used as a reference in the microwave range

Keywords

carbon fibres; composite materials; electrical conductivity measurement; inclusions; microwave measurement; μm diameter; C; C fibre; composite; dielectric properties; electric conductivity; microwave measurement; mm length; open cavity; perturbations; spheroidal inclusions; Conducting materials; Conductivity measurement; Dielectric materials; Dielectric measurements; Frequency measurement; Microwave frequencies; Microwave measurements; Microwave theory and techniques; Optical fiber polarization; Permittivity measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.872912

Filename

872912