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Hydrophobicity estimation of HV polymeric insulating materials. Development of a digital image processing method.
Uppsala University, Sweden.
Uppsala University, Sweden.ORCID iD: 0000-0002-1607-2493
Uppsala University, Sweden.
2001 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 8, no 6, p. 1098-1107Article in journal (Refereed) Published
Abstract [en]

Image analysis of water drop patterns on an inclined flat polymeric insulator surface has been performed in order to find a simple mathematical function that indicates the level of hydrophobicity of the insulator surface. A simple function, given the acronym average of normalized entropies (ANE), seems to correlate well with hydrophobicity as defined by the Swedish Transmission Research Institute (STRI) hydrophobicity classification. It is a composition of three other functions, viz. the standard deviation, the Shannon information entropy and the 'fraction of small differences'. All these are in turn based on the histogram of horizontal nearest-neighbor pixel differences for a given digital greyscale image of a water drop pattern. ANE is fairly independent of illumination intensity (exposure) as well as total gain and offset in a camera system (linear sensor). The experimental results also indicate that ANE is fairly independent of limited changes in the surface inclination, although this needs further investigation. Some of the various pitfalls associated with the photography of water drop patterns and processing of images are identified, together with possible solutions for avoiding them.

Place, publisher, year, edition, pages
2001. Vol. 8, no 6, p. 1098-1107
Keywords [en]
Power Engineering, Insulators, Hydrophobicity, Polymeric Insulation, organic insulating materials, image processing, drops
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-238769DOI: 10.1109/94.971470OAI: oai:DiVA.org:kth-238769DiVA, id: diva2:1262301
Note

QC 20181217

Available from: 2018-11-10 Created: 2018-11-10 Last updated: 2018-12-17Bibliographically approved

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Publisher's full texthttps://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=971470

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Thottappillil, Rajeev

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