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Quality assessment of varistor ZnO structures by resonant ultrasound spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group. (Signals and systems)
2009 (English)In: Insight (Northampton), ISSN 1354-2575, E-ISSN 1754-4904, Vol. 51, no 5, 262-265 p.Article in journal (Refereed) Published
Abstract [en]

Varistors are produced from ZnO cylindrically-shaped structures whose quality depends on varying technological conditions at stages of their shape forming and firing. Therefore, the varistors art, tested at the final phase of production and faulty elements are excluded. We propose to test the quality of ZnO structures at an earlier stage of production to eliminate defective structures from further and expensive processing. The recommended method applies resonant ultrasound spectroscopy that meets the demand for limiting the costs introduced by an additional measurement procedure. This paper presents the prepared   economical measurement system. that can be used for this purpose The proposed method measures one of the lowest resonant frequencies and dimensions of the tested specimen. The measured quantities enable the estimation of a parameter that is proportional to the sound velocity,  in the tested ZnO sample and gives information about the quality of the   ZnO structure. Detailed experimental data obtained for two batches of  ZnO structures, oil purpose prepared in different ways, are analysed to confirm the usefulness of the applied procedure in industrial applications.

Place, publisher, year, edition, pages
2009. Vol. 51, no 5, 262-265 p.
Keyword [en]
varistor, zinc oxide, quality assessment, resonant ultrasound spectroscopy
National Category
Signal Processing
Research subject
Electrical Engineering with specialization in Signal Processing
URN: urn:nbn:se:uu:diva-111457DOI: 10.1784/insi.2009.51.5.262ISI: 000265970000005OAI: oai:DiVA.org:uu-111457DiVA: diva2:281276
Available from: 2009-12-15 Created: 2009-12-15 Last updated: 2016-04-14Bibliographically approved

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Stepinski, Tadeusz
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