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Laser-excited fluorescence probes for surface flashover studies of the insulator celcon

We report on the utilization of fluorescence probes for the study of damage to the insulator Celcon under electrical stress and surface flashover. Such probes reveal chemical and structural changes caused by application of voltages that are far lower than the surface flashover voltage. In particular, we describe results observed with the fluorescence probes rhodamine 6G, rhodamine 101, and Eastman Yellow.