A fiber Bragg grating-bimetal temperature sensor for solar panel inverters

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This paper reports the design, characterization and implementation of a Fiber Bragg Grating (FBG)-based temperature sensor for an Insulted-Gate Bipolar Transistor (IGBT) in a solar panel inverter. The FBG is bonded to the higher Coefficient of Thermal Expansion (CTE) side of a bimetallic strip to increase its sensitivity. Characterization results show a linear relationship between increasing temperature and the wavelength shift. It is found that the sensitivity of the sensor can be categorized into three characterization temperature regions between 26 °C and 90 °C. The region from 41 °C to 90 °C shows the highest sensitivity, with a value of 14 pm/°C. A new empirical model that considers both temperature and strain effects has been developed for the sensor. Finally, the FBG-bimetal temperature sensor is placed in a solar panel inverter and results confirm that it can be used for real-time monitoring of the IGBT temperature. © 2011 by the authors; licensee MDPI, Basel, Switzerland.




Afiq, M. I., Tamchek, N., Rosdi, M. A. H., Dambul, K. D., Selvaraj, J., Abd, N. R., … Rafiq, F. M. A. (2011). A fiber Bragg grating-bimetal temperature sensor for solar panel inverters. Sensors, 11(9), 8665–8673. https://doi.org/10.3390/s110908665

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