Improved calibration of a large open-ended coaxial probe for dielectric measurements

Author

Otto, G.P. ; Chew, W.C.

Author_Institution

Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA

Volume

40

Issue

4

fYear

1991

fDate

8/1/1991 12:00:00 AM

Firstpage

742

Lastpage

746

Abstract

An improved method for calibrating an open-ended coaxial sensor is proposed. The calibration utilizes the measurements of an open, a short, and a short-cavity. These terminations are inexpensive to make and result in a calibration that depends only on the geometry of the sensor. The short-cavity is modeled by waveguide modal techniques and the theoretical reflection coefficient determined to any accuracy. Consequently, an improvement in the accuracy of the measurements is obtained over a large bandwidth. The calibration was tested by comparing theoretical and experimental values of the complex permittivity for common liquids, and the discrepancy was seen to be small

Keywords

calibration; coaxial cables; dielectric properties of liquids and solutions; electric sensing devices; permittivity measurement; probes; calibration; complex permittivity; dielectric measurements; geometry; liquids; open-ended coaxial probe; reflection coefficient; waveguide modal techniques; Bandwidth; Calibration; Coaxial components; Geometry; Liquids; Permittivity measurement; Probes; Reflection; Testing; Waveguide theory;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.85345

Filename

85345