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Image analysis and laser induced fluorescence combined to determine biological growth on silicone rubber insulators

Wallstrom, S; Dernfalk, AD; Bengtsson, Magnus LU ; Kröll, Stefan LU ; Gubanski, SM and Karlsson, S (2005) In Polymer Degradation and Stability 88(3). p.394-400
Abstract
High-voltage outdoor insulators made from silicone rubber are sometimes reported to be colonised by microorganisms. When the hydrophobic polymeric surface is covered by a hydrophilic biofilm, the electrical properties of the insulator are altered. In this work, mixed biofilms, similar to those formed on the surfaces of polymeric insulators in the field, were successfully grown on five types of silicone rubber substrates in the laboratory, using specially designed microenvironment chambers. Photography and digital image analysis were utilized to estimate the areas covered by the growth. It was found that direct UV-light exposure hindered growth of the biofilms. Further, growth was also hindered on samples where zinc borate had been added as... (More)
High-voltage outdoor insulators made from silicone rubber are sometimes reported to be colonised by microorganisms. When the hydrophobic polymeric surface is covered by a hydrophilic biofilm, the electrical properties of the insulator are altered. In this work, mixed biofilms, similar to those formed on the surfaces of polymeric insulators in the field, were successfully grown on five types of silicone rubber substrates in the laboratory, using specially designed microenvironment chambers. Photography and digital image analysis were utilized to estimate the areas covered by the growth. It was found that direct UV-light exposure hindered growth of the biofilms. Further, growth was also hindered on samples where zinc borate had been added as flame retardant. In contrast, addition of ATH did not influence the growth. In parallel, LIF spectroscopy was explored as a tool for detection of biofilms on silicon rubber samples. Experiments revealed that even weak traces of growth, not visible to the naked eye, could be detected. Finally, it is believed that LIF spectroscopy in combination with image analysis can be used for field diagnostics of biological growth on insulators in service. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
LIF, image analysis, biofilm, silicone rubber, biological growth, insulators
in
Polymer Degradation and Stability
volume
88
issue
3
pages
394 - 400
publisher
Elsevier
external identifiers
  • wos:000228789700005
  • scopus:14844286478
ISSN
1873-2321
DOI
10.1016/j.polymdegradstab.2004.12.009
language
English
LU publication?
yes
id
c08b8e6f-556c-4f51-a6eb-a3a91a875a0c (old id 243878)
date added to LUP
2007-08-15 16:16:07
date last changed
2017-05-07 04:17:01
@article{c08b8e6f-556c-4f51-a6eb-a3a91a875a0c,
  abstract     = {High-voltage outdoor insulators made from silicone rubber are sometimes reported to be colonised by microorganisms. When the hydrophobic polymeric surface is covered by a hydrophilic biofilm, the electrical properties of the insulator are altered. In this work, mixed biofilms, similar to those formed on the surfaces of polymeric insulators in the field, were successfully grown on five types of silicone rubber substrates in the laboratory, using specially designed microenvironment chambers. Photography and digital image analysis were utilized to estimate the areas covered by the growth. It was found that direct UV-light exposure hindered growth of the biofilms. Further, growth was also hindered on samples where zinc borate had been added as flame retardant. In contrast, addition of ATH did not influence the growth. In parallel, LIF spectroscopy was explored as a tool for detection of biofilms on silicon rubber samples. Experiments revealed that even weak traces of growth, not visible to the naked eye, could be detected. Finally, it is believed that LIF spectroscopy in combination with image analysis can be used for field diagnostics of biological growth on insulators in service.},
  author       = {Wallstrom, S and Dernfalk, AD and Bengtsson, Magnus and Kröll, Stefan and Gubanski, SM and Karlsson, S},
  issn         = {1873-2321},
  keyword      = {LIF,image analysis,biofilm,silicone rubber,biological growth,insulators},
  language     = {eng},
  number       = {3},
  pages        = {394--400},
  publisher    = {Elsevier},
  series       = {Polymer Degradation and Stability},
  title        = {Image analysis and laser induced fluorescence combined to determine biological growth on silicone rubber insulators},
  url          = {http://dx.doi.org/10.1016/j.polymdegradstab.2004.12.009},
  volume       = {88},
  year         = {2005},
}