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Dielectric Replica Measurement: A New Technique for Obtaining the Complex Permittivity of Irregularly Shaped Objects

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Dielectric Replica Measurement : A New Technique for Obtaining the Complex Permittivity of Irregularly Shaped Objects. / Robinson, Martin Paul; Fitton, Laura Catherine; Little, Aimee Patrice; Cobb, Samuel Nicholas Frederick; Ashby, Steven Paul.

In: Measurement Science and Technology, Vol. 30, 045902 , 11.03.2019.

Research output: Contribution to journalArticle

Harvard

Robinson, MP, Fitton, LC, Little, AP, Cobb, SNF & Ashby, SP 2019, 'Dielectric Replica Measurement: A New Technique for Obtaining the Complex Permittivity of Irregularly Shaped Objects', Measurement Science and Technology, vol. 30, 045902 . https://doi.org/10.1088/1361-6501/ab0466

APA

Robinson, M. P., Fitton, L. C., Little, A. P., Cobb, S. N. F., & Ashby, S. P. (2019). Dielectric Replica Measurement: A New Technique for Obtaining the Complex Permittivity of Irregularly Shaped Objects. Measurement Science and Technology, 30, [045902 ]. https://doi.org/10.1088/1361-6501/ab0466

Vancouver

Robinson MP, Fitton LC, Little AP, Cobb SNF, Ashby SP. Dielectric Replica Measurement: A New Technique for Obtaining the Complex Permittivity of Irregularly Shaped Objects. Measurement Science and Technology. 2019 Mar 11;30. 045902 . https://doi.org/10.1088/1361-6501/ab0466

Author

Robinson, Martin Paul ; Fitton, Laura Catherine ; Little, Aimee Patrice ; Cobb, Samuel Nicholas Frederick ; Ashby, Steven Paul. / Dielectric Replica Measurement : A New Technique for Obtaining the Complex Permittivity of Irregularly Shaped Objects. In: Measurement Science and Technology. 2019 ; Vol. 30.

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@article{345d46a318654c5ab19b3285b7b69c2e,
title = "Dielectric Replica Measurement: A New Technique for Obtaining the Complex Permittivity of Irregularly Shaped Objects",
abstract = "Dielectric measurements provide valuable information about the properties of materials, and could be used to classify and identify the source of objects, in fields such as archaeology. Current methods of identification are all partly destructive, so an innovative electromagnetic method developed by the authors, based on resonant cavity perturbation (RCP), provides an attractive, non-destructive alternative. A problem with traditional RCP is that the changes in frequency and Q-factor vary with the object’s shape; however we overcome this by creating a replica of the object, from a material whose dielectric properties are known. Then, by combining three separate perturbations with orthogonal field directions, due firstly to the object and then to its replica, we eliminate the shape dependency, and thus determine the object’s dielectric constant and loss factor. After developing the theory of this novel DRM technique, we demonstrate the principle using a set of geometric shapes made in both polytetrafluoroethylene (PTFE) and a 3D printed material. Further measurements then enable second-order terms to be included in the model, improving its accuracy. Finally, DRM is shown to be capable of distinguishing two irregularly shaped objects of different materials. Potential applications of DRM include determining the provenance of pottery, glasses and flints, and distinguishing ivory from bone. These would be of interest to customs and environmental agencies, as well as museum curators and archaeologists.",
keywords = "Dielectric measurement, complex permittivity, archaeology, artefact, non-destructive testing, resonant cavity, network analyser, 3D printing",
author = "Robinson, {Martin Paul} and Fitton, {Laura Catherine} and Little, {Aimee Patrice} and Cobb, {Samuel Nicholas Frederick} and Ashby, {Steven Paul}",
note = "{\circledC} 2019 IOP Publishing Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.",
year = "2019",
month = "3",
day = "11",
doi = "10.1088/1361-6501/ab0466",
language = "English",
volume = "30",
journal = "Measurement Science and Technology",
issn = "0957-0233",
publisher = "IOP Publishing Ltd.",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Dielectric Replica Measurement

T2 - Measurement Science and Technology

AU - Robinson, Martin Paul

AU - Fitton, Laura Catherine

AU - Little, Aimee Patrice

AU - Cobb, Samuel Nicholas Frederick

AU - Ashby, Steven Paul

N1 - © 2019 IOP Publishing Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.

PY - 2019/3/11

Y1 - 2019/3/11

N2 - Dielectric measurements provide valuable information about the properties of materials, and could be used to classify and identify the source of objects, in fields such as archaeology. Current methods of identification are all partly destructive, so an innovative electromagnetic method developed by the authors, based on resonant cavity perturbation (RCP), provides an attractive, non-destructive alternative. A problem with traditional RCP is that the changes in frequency and Q-factor vary with the object’s shape; however we overcome this by creating a replica of the object, from a material whose dielectric properties are known. Then, by combining three separate perturbations with orthogonal field directions, due firstly to the object and then to its replica, we eliminate the shape dependency, and thus determine the object’s dielectric constant and loss factor. After developing the theory of this novel DRM technique, we demonstrate the principle using a set of geometric shapes made in both polytetrafluoroethylene (PTFE) and a 3D printed material. Further measurements then enable second-order terms to be included in the model, improving its accuracy. Finally, DRM is shown to be capable of distinguishing two irregularly shaped objects of different materials. Potential applications of DRM include determining the provenance of pottery, glasses and flints, and distinguishing ivory from bone. These would be of interest to customs and environmental agencies, as well as museum curators and archaeologists.

AB - Dielectric measurements provide valuable information about the properties of materials, and could be used to classify and identify the source of objects, in fields such as archaeology. Current methods of identification are all partly destructive, so an innovative electromagnetic method developed by the authors, based on resonant cavity perturbation (RCP), provides an attractive, non-destructive alternative. A problem with traditional RCP is that the changes in frequency and Q-factor vary with the object’s shape; however we overcome this by creating a replica of the object, from a material whose dielectric properties are known. Then, by combining three separate perturbations with orthogonal field directions, due firstly to the object and then to its replica, we eliminate the shape dependency, and thus determine the object’s dielectric constant and loss factor. After developing the theory of this novel DRM technique, we demonstrate the principle using a set of geometric shapes made in both polytetrafluoroethylene (PTFE) and a 3D printed material. Further measurements then enable second-order terms to be included in the model, improving its accuracy. Finally, DRM is shown to be capable of distinguishing two irregularly shaped objects of different materials. Potential applications of DRM include determining the provenance of pottery, glasses and flints, and distinguishing ivory from bone. These would be of interest to customs and environmental agencies, as well as museum curators and archaeologists.

KW - Dielectric measurement

KW - complex permittivity

KW - archaeology

KW - artefact

KW - non-destructive testing

KW - resonant cavity

KW - network analyser

KW - 3D printing

U2 - 10.1088/1361-6501/ab0466

DO - 10.1088/1361-6501/ab0466

M3 - Article

VL - 30

JO - Measurement Science and Technology

JF - Measurement Science and Technology

SN - 0957-0233

M1 - 045902

ER -