Díaz Lucas, SilviaFuentes Lorenzo, OmarTorres Betancourt, Angie TatianaCorres Sanz, Jesús MaríaMatías Maestro, Ignacio2023-09-182023-09-182023Diaz, S., Fuentes, O., Torres, A., Corres, J. M., & Matías, I. R. (2023). Highly sensitive sensor for measuring material thermal expansion using a ring laser. IEEE Sensors Letters, 7(10), 1-4. https://doi.org/10.1109/LSENS.2023.3312996.2475-147210.1109/LSENS.2023.3312996https://academica-e.unavarra.es/handle/2454/46366A new thermal expansion sensor is presented in this letter. It combines an interferometric fiber sensor and an erbium-doped fiber ring laser as the light source. The sensor consists of a combination of single-mode, hollow-core, and no-core mirror fibers. The sensor was tested on two different types of based metal, such as aluminum and steel, giving sensitivities as high as 38.7 and 5.75 nm/°C, respectively, showing good performance.application/pdfeng© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other work.Sensor phenomenaOptical sensorsErbium-doped fiber (EDF)Hollow-core (HC) fiberRing laserinfo:eu-repo/semantics/article2023-09-18info:eu-repo/semantics/openAccess