NDLI: A Time-Domain Reflectometry Method with Variable Needle Pulse Width for Measuring the Dielectric Properties of Materials

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A Time-Domain Reflectometry Method with Variable Needle Pulse Width for Measuring the Dielectric Properties of Materials

Content Provider	MDPI
Author	Wilczek, Andrzej Szypłowska, Agnieszka Kafarski, Marcin Skierucha, Wojciech
Abstract	Time-domain reflectometry (TDR) methods used for measuring the dielectric properties of materials mostly utilize step or needle electrical pulses of constant amplitudes and shapes. Our novel approach enables determining the dielectric relaxation time of a sample using the analysis of the amplitudes of reflected pulses of two widths, in addition to bulk dielectric permittivity and electrical conductivity commonly obtained by the TDR technique. The method was developed for various values of electrical conductivity and relaxation time using numerical simulations of a five-rod probe placed in a material with complex dielectric permittivity described by the Debye model with an added electrical conductivity term. The characterization of amplitudes of two pulses of selected widths was done with regard to the dielectric parameters of simulated materials. The required probe parameters were obtained solely from numerical simulations. Verification was performed for the probe placed in aqueous KCl solutions with 14 different electrical conductivity values. The determined relaxation time remained roughly constant and independent of electrical conductivity. The obtained electrical conductivity agreed with the reference values. Our results indicate that the relaxation time, dielectric permittivity and electrical conductivity of the tested solutions can be simultaneously determined using a simple analysis of the amplitude and reflection time of two needle pulses of different widths.
File Size	2498560
File Format	PDF
e-ISSN	14248220
DOI	10.3390/s16020191
Journal	Sensors
Issue Number	2
Volume Number	16
Language	English
Publisher Date	2016-02-04
Access Restriction	Open
Subject Keyword	time-domain reflectometry (TDR) dielectric permittivity relaxation time Debye model FDTD simulations
Content Type	Text
Resource Type	Article

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