On the scaling of digital cameras to quantify the intensity of corona discharges
Corona and surface discharges emit ultraviolet and visible light. Therefore, imaging sensors can be used to detect and locate such discharges. These sensors offer many advantages, including high sensitivity, high resolution, high immunity to electromagnetic noise, low cost, and direct localization o...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/451033 |
| Acceso en línea: | https://hdl.handle.net/2117/451033 https://dx.doi.org/10.1016/j.measurement.2026.120343 |
| Access Level: | acceso abierto |
| Palabra clave: | Calibration Scaling Corona discharges Image intensity Partial discharges periodic charge Pulse charge Àrees temàtiques de la UPC::Enginyeria elèctrica |
| Sumario: | Corona and surface discharges emit ultraviolet and visible light. Therefore, imaging sensors can be used to detect and locate such discharges. These sensors offer many advantages, including high sensitivity, high resolution, high immunity to electromagnetic noise, low cost, and direct localization of discharge points. However, information about their scaling is lacking, i.e., how to relate the optical response of the sensor to the electrical charge involved in the discharge process. Using adequately scaled sensors is essential for making informed engineering and maintenance decisions. This paper focuses on this issue by proposing a method to scale digital camera responses by establishing a relationship between digital image intensity and the charge involved in electrical discharge phenomena. Though not a standard method, it allows for simple, direct localization of the discharge region and objective quantification of discharge severity. The proposed scaling method is applied to three electrode geometries—needle-plane, rod-plane, and sphere-plane—that generate discharge pulses between 20¿pC and 1200¿pC. Despite the wide variation in electrode geometries, the scaling results presented in this work prove to be consistently reliable and accurate. The fitted scaling curves achieve coefficients of determination greater than 0.998. |
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