Laser-excited fluorescence and fluorescence probes for diagnosing bulk damage in cable insulation

Ishmael D. Ordonez; J. Crafton; R. H. Murdock; Lynn L. Hatfield; E. Roland Menzel

doi:10.1117/12.45144

1 April 1991 Laser-excited fluorescence and fluorescence probes for diagnosing bulk damage in cable insulation

Ishmael D. Ordonez, J. Crafton, R. H. Murdock, Lynn L. Hatfield, E. Roland Menzel

Proceedings Volume 1437, Applied Spectroscopy in Material Science; (1991) https://doi.org/10.1117/12.45144
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Laser excited fluorescence (LEF) and fluorescence probes have been used to observe bulk damage in aged cross-linked polyethylene (XLPE) insulation of power transmission cable. 'Water trees' in the shape of bow-ties (50 micrometers to 1 mm) and striations near the cable core were observed under a microscope when the aged XLPE samples were irradiated by an Argon-ion laser. Changes in the bulk fluorescence of samples subjected to various aging conditions were observed as well. XLPE samples could be bulk-stained by soaking them in solutions of fluorescent dyes such as rhodamine 6G, Acridine Yellow G, resorufin and Nile Red in order to probe and highlight defects under similar LEF conditions. Resorufin proved useful for preferential staining of the water-trees making them flagrantly visible. Rhodamine 6G and Acridine Yellow G soaked samples provided evidence of chemical and/or physical changes surrounding these trees: A halo arising from dye fluorescence quenching could be observed surrounding the trees. The chemical and spectroscopic properties of fluorescent probes may provide insight into chemical/physical features of observed defects.

Citation Download Citation

Ishmael D. Ordonez, J. Crafton, R. H. Murdock, Lynn L. Hatfield, and E. Roland Menzel "Laser-excited fluorescence and fluorescence probes for diagnosing bulk damage in cable insulation", Proc. SPIE 1437, Applied Spectroscopy in Material Science, (1 April 1991); https://doi.org/10.1117/12.45144

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