Comparison of Reflection and Transmission Method and Metal Back Method Measurement of Dielectric properties of transformer oil using free space microwave measurement system in 8 - 12 GHz frequency range

Aris, Mohd Aziz; Kadir, Ermeey Abd; Ghodgaonkar, D.K.; Khadri, N.

doi:10.1109/apmc.2009.5384366

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…The setup shown in Figure 7 can be also employed for online monitoring transformer oil doing a bypass in the cooling system of power transformer. It will be more relevant compared with slotline technique [7] or free-space realization [8]. 4.…”

Section: Experimental Setup and Measured Resultsmentioning

confidence: 99%

Application of the cut‐off resonator for microwave monitoring of transformer oil

Kapilevich

Lipsky

Litvak

2010

Micro & Optical Tech Letters

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This paper describes a cut‐off resonator designed for testing transformer oil is proposed.The two kinds of transformer oil have been compared—“fresh” (unused) and “old” (used) for a long period in real‐world conditions. The experimental setup has been designed and assembled on the basis of the cut‐off resonator with plastic tube containing the tested oil. There was observed the shift of resonance curves of the measured insertion losses between the “old” and the “fresh” samples. Also, the “old” oil has higher insertion loss that is caused by increasing its loss tangent compared with the “fresh” oil. These parameters can be used for estimating quality of the transformer oils. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:66–68, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25630

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Section: Experimental Setup and Measured Resultsmentioning

confidence: 99%

Application of the cut‐off resonator for microwave monitoring of transformer oil

Kapilevich

Lipsky

Litvak

2010

Micro & Optical Tech Letters

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“…The measurement procedure for extracting the dielectric constants of the materials under test is discussed in the report by Ghodgaonkar et al [ 14 ] and has been used in a variety of research papers [ 16 , 17 ]. Basically, this procedure involves measuring the reflected signal from a flat material sample that has a perfectly conducting plate underneath, just as Figure 2 shows, where the reference material, a 10 mm thick slab of Teflon, is placed over a metal plate.…”

Section: Methodsmentioning

confidence: 99%

“…Several root-finding algorithms have been utilized along the years to infer

in these type of measurements; the Newton–Raphson and Müller algorithm with deflation are the most popular [ 14 , 17 ]; however, they need an initial good estimate of the permittivity for their convergence. In this research, the estimation of

is not known a priori; therefore, finding a solution with these algorithms may be a tedious task.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Metal-Backed Free-Space and Open-Ended Coaxial Probe Techniques for the Dielectric Characterization of Aeronautical Composites

López-Rodríguez

Escot-Bocanegra

Poyatos-Martínez

et al. 2016

Sensors

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The trend in the last few decades is that current unmanned aerial vehicles are completely made of composite materials rather than metallic, such as carbon-fiber or fiberglass composites. From the electromagnetic point of view, this fact forces engineers and scientists to assess how these materials may affect their radar response or their electronics in terms of electromagnetic compatibility. In order to evaluate this, electromagnetic characterization of different composite materials has become a need. Several techniques exist to perform this characterization, all of them based on the utilization of different sensors for measuring different parameters. In this paper, an implementation of the metal-backed free-space technique, based on the employment of antenna probes, is utilized for the characterization of composite materials that belong to an actual drone. Their extracted properties are compared with those given by a commercial solution, an open-ended coaxial probe (OECP). The discrepancies found between both techniques along with a further evaluation of the methodologies, including measurements with a split-cavity resonator, conclude that the implemented free-space technique provides more reliable results for this kind of composites than the OECP technique.

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“…For these applications, a variety of techniques have been studied for measuring permittivity properties of materials at many frequency bands [20–33]. Among these existing permittivity measurement techniques, the parallel plate capacitor method [20, 21], the transmission line method [22–24] and the free space method [29] are not quite suitable for liquids, because the liquid molecules are not rigidly bounded and have much greater freedom to move around than solids. The coaxial probe method [25–27] is of limited accuracy with the main sources of errors from the calibration errors and the air gap near the probe etc.…”

Section: Introductionmentioning

confidence: 99%

Liquid‐based dielectric resonator antenna and its application for measuring liquid real permittivities

Zhou

Zhang

Xin³

2014

IET Microwaves, Antennas & Propagation

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In this study, a water‐based rectangular dielectric resonator antenna is designed and analysed. The compactness of the antenna because of the high relative permittivity of water is demonstrated in both simulation and experiment. In addition, a dielectric resonator antenna‐based technique is proposed for measuring liquid permittivities. The resonance frequencies of the antennas with fixed configurations are obtained from finite‐element electromagnetic (EM) simulation for liquids with different permittivity values. An analytical model of liquid permittivity as a function of the antenna resonance frequency is then developed. Based on this predictive model, the measurement of the liquid real relative permittivity can be easily achieved by measuring the antenna resonance frequency. The measured permittivity values of distilled water and 10% glucose solution are in agreement with previous data in the literature, demonstrating the effectiveness of the proposed liquid permittivity measurement technique.

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Comparison of Reflection and Transmission Method and Metal Back Method Measurement of Dielectric properties of transformer oil using free space microwave measurement system in 8 - 12 GHz frequency range

Cited by 5 publications

References 9 publications

Application of the cut‐off resonator for microwave monitoring of transformer oil

Application of the cut‐off resonator for microwave monitoring of transformer oil

Comparison of Metal-Backed Free-Space and Open-Ended Coaxial Probe Techniques for the Dielectric Characterization of Aeronautical Composites

Liquid‐based dielectric resonator antenna and its application for measuring liquid real permittivities

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