Integration of the Phase Shift Method Into Intensity-Modulated Optical Sensors for Extended-Range Distance Measurements in Aircraft Engines
This work presents a dual-mode optical sensing system that integrates the phase shift method (PSM) into an existing intensity-modulated optical fiber displacement sensor to extend the measurement range for blade tip clearance (BTC) applications from 5 to 30 mm. The proposed enhancement requires only...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Universidad del País Vasco |
| Repositorio: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:dnet:addi________::19acf183f531992f1c443e401e8a0a3c |
| Acceso en línea: | http://hdl.handle.net/10810/79188 |
| Access Level: | acceso abierto |
| Palabra clave: | aero-engine condition monitoring blade tip clearance (BTC) fiber optic-based displacement sensor phase shift method (PSM) |
| Sumario: | This work presents a dual-mode optical sensing system that integrates the phase shift method (PSM) into an existing intensity-modulated optical fiber displacement sensor to extend the measurement range for blade tip clearance (BTC) applications from 5 to 30 mm. The proposed enhancement requires only minimal modifications to the original probe configuration, including high-frequency light modulation at 100 MHz and insertion of a fiber optic coupler. These adjustments enable simultaneous, interference-free operation of the PSM and the intensity modulation technique (IMT) within a single platform for blade-distance detection. The system is designed to accommodate targets with varying reflectivity without recalibration and to automatically reject weak signals, improving reliability and simplifying integration. Dynamic tests validate the concurrent operation and complementary behavior of both methods: the IMT provides high sensitivity at short ranges, whereas the PSM ensures robust performance over extended distances. Experimental results confirm the feasibility of an extended-range, dual-mode optical sensing approach, offering a promising solution for next-generation aero-engine diagnostics where precision, adaptability, and robustness are critical. |
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