Robinson, Martin Paul orcid.org/0000-0003-1767-5541, Fitton, Laura Catherine orcid.org/0000-0003-4641-931X, Little, Aimee Patrice orcid.org/0000-0003-4713-4260 et al. (2 more authors) (2019) Dielectric Replica Measurement:A New Technique for Obtaining the Complex Permittivity of Irregularly Shaped Objects. Measurement Science and Technology. 045902. ISSN 0957-0233
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 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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 IOP Publishing Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. |
Keywords: | Dielectric measurement,complex permittivity,archaeology,artefact,non-destructive testing,resonant cavity,network analyser,3D printing |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Electronic Engineering (York) The University of York > Faculty of Sciences (York) > Hull York Medical School (York) The University of York > Faculty of Arts and Humanities (York) > Archaeology (York) |
Depositing User: | Pure (York) |
Date Deposited: | 05 Feb 2019 17:30 |
Last Modified: | 26 Jan 2025 00:13 |
Published Version: | https://doi.org/10.1088/1361-6501/ab0466 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/1361-6501/ab0466 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:142099 |
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