Radiant energy – Luminophor irradiation
Patent
1991-09-26
1993-08-31
Fields, Carolyn E.
Radiant energy
Luminophor irradiation
2504591, G01N 2164
Patent
active
052411842
ABSTRACT:
The remaining life of transmission cable insulation is quantized by irradiating the insulation with excitation energy causing it to emit a bulk fluorescence spectrum. The intensity of the bulk fluorescence spectrum is then measured at at least two wavelengths and an intensity ratio determined at these wavelengths. The magnitude of the resultant ratio correlates with the age and condition of the insulation under test, and allows estimation of the remaining transmission cable insulation lifetime. Such measurements may be made in situ if the transmission cable includes a projecting fiber optic cable having first and second ends. The first end of the fiber optic cable is embedded within the cable so as to touch the insulation, and the second end is adapted to receive energy causing the bulk fluorescence, and is further adapted to optically communicate the bulk fluorescence to an optical measurement system that determines intensities and ratios. In this fashion, the remaining lifetime of insulation within a transmission cable may be estimated, even though the transmission cable remains buried underground.
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Dunn Drew A.
Electric Power Research Institute
Fields Carolyn E.
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