Dielectric measurements with an open-ended coaxial probe

Marsland, T.P.; Evans, Stephen D.

doi:10.1049/ip-h-2.1987.0068

Cited by 166 publications

(122 citation statements)

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“…The complex relative permittivity of a sample can thus be determined from S 11 in line with the following bilinear equation that is based on (9), (13), and (14) [23], [9] …”

Section: B Open-ended Coaxial Probe (Oc)mentioning

confidence: 99%

“…Accordingly, the same equation containing two Cole-Cole terms and a direct current (DC) conductivity term is also used to characterize the spectra Fig. 4 shows the curve fitting by using (23) on the measured dielectric spectra of compacted kaolin with w=20.5%. The discrepancy between the total fit and the experimental data at the low frequency tail in the r ε ′ -spectrum (see Fig.…”

Section: A Modified Compacted Kaolinmentioning

confidence: 99%

See 1 more Smart Citation

Broadband Dielectric Measurement Methods for Soft Geomaterials: Coaxial Transmission Line Cell and Open-Ended Coaxial Probe

Chen¹,

Schwing²,

Karlovšek³

et al. 2014

IJET

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I. INTRODUCTIONDue to their intrinsic merits including non/less-invasive virtue and capability of automation and remote sensing, geophysical electromagnetic (EM) methods such as time domain reflectometry (TDR) [1] and ground penetrating radar (GPR) [2] have long been recognized as effective and practical methods in geomaterials characterization [3], [4]. Generally measuring time or frequency dependent EM properties of geomaterials as response to an applied EM field, EM methods are able to characterize geomaterials in terms of correlations between their EM properties and compositional and structural properties. Successful applications of EM methods in this regard have been massively witnessed since decades ago, among which the determination of water content of geomaterials is probably the most well-known one [5].Despite its great success, the application of EM methods in geomaterials characterization is still confronted with many theoretical and technical difficulties. Almost all geomaterials are heterogeneous systems composed of components with different physicochemical properties. Complex EM properties of some constituent components in addition to interface processes arising from the interaction between those components make the overall EM properties of most geomaterials extremely complicated. Theoretical consideration on their EM properties is greatly challenged by this complication because it is difficult to take all factors into account. However, carefully designed experimental studies are able to determine factors that dominate the EM properties of geomaterial at defined environments and thereby able to greatly simplify and/or optimize theoretical consideration. Experimental studies, especially in a broad frequency range, are also able to find out correlations between EM properties and other engineering parameters of geomaterials, which are practical in field investigation.On the other hand, EM properties of a geomaterial are generally affected by a great number of factors related to environmental parameters as well as its compositional and structural nature. For civil engineering purposes, it is intended to measure EM properties of geomaterials without disturbing their engineering nature. Optimized measurement protocol in combination with non-destructive sample cells is therefore highly desirable to this end. Open-ended coaxial probe (OC) has long been used as a non-destructive sample cell in the characterization of various materials including biological tissues [6], [7], liquids [8]-[10], and geomaterials [11]-[14]. Since the sample under test has to be fully contacted with the flat end of this type of probe, it is generally only suitable for soft materials or hard materials with ideally flat surface. In addition, due to the size of this type of probe, the effective measurement volume is normally limited to the order of cm 3 . A non-destructive two-port coaxial transmission line cell (CC) recently developed by Lauer et al. [15] is able to measure a larger sample volume but still keep the sample undistur...

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“…The complex relative permittivity of a sample can thus be determined from S 11 in line with the following bilinear equation that is based on (9), (13), and (14) [23], [9] …”

Section: B Open-ended Coaxial Probe (Oc)mentioning

confidence: 99%

Section: A Modified Compacted Kaolinmentioning

confidence: 99%

Broadband Dielectric Measurement Methods for Soft Geomaterials: Coaxial Transmission Line Cell and Open-Ended Coaxial Probe

Chen¹,

Schwing²,

Karlovšek³

et al. 2014

IJET

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show abstract

“…Another issue of this technique concerns the probe calibration, which is usually carried out in three steps with factory-standard calibration loads (short, open and load terminations) (Blackham and Pollard (1997)). In order to improve the accuracy of the measurement, reference loads with liquids of known permittivity (Marsland and Evans (1987)) or short-cavitiy terminations (Otto and Chew (1991)) have been proposed.…”

Section: One-port Techniques 211 Open-ended Coaxial Probementioning

confidence: 99%

Electric and Magnetic Characterization of Materials

Sandrolini¹,

Reggiani²,

Artioli³

2011

Behaviour of Electromagnetic Waves in Different Media and Structures

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“…Various microwave techniques have been introduced in literature to characterize the electrical properties of materials. They include open-ended waveguide/coaxial probe methods [18], free-space techniques [16], stripline [20], transmission/reflection [4] and resonant [22] procedures, all having specific advantages and constraints. Among them, open resonator methods [10,11,13,15,17,25] give the most powerful tool to accurately retrieve the equivalent impedance properties of low-loss thin dielectric surfaces.…”

Section: Introductionmentioning

confidence: 99%