Fuentes Lorenzo, OmarDel Villar, IgnacioVento Álvarez, José RaúlSocorro Leránoz, Abián BentorGallego Martínez, Elieser ErnestoCorres Sanz, Jesús MaríaMatías Maestro, Ignacio2018-03-272018-03-272017O. Fuentes et al., "Increasing the Sensitivity of an Optic Level Sensor With a Wavelength and Phase Sensitive Single-Mode Multimode Single-Mode Fiber Structure," in IEEE Sensors Journal, vol. 17, no. 17, pp. 5515-5522, Sept.1, 1 2017. doi: 10.1109/JSEN.2017.27248491530-437X10.1109/JSEN.2017.2724849https://academica-e.unavarra.es/handle/2454/28097The sensitivity of a liquid level sensor based on a single-mode-multimode-single-mode fiber structure has been increased by hydrofluoric acid etching. The etching process was analyzed and monitored both theoretical and experimentally, which permitted to observe that a sinusoidal spectrum can be obtained for low diameters. As an example, a 2.77 fold sensitivity increase was attained by etching from diameter 125 to 50 μm. Moreover, the sinusoidal shape of the optical spectrum permitted to monitor liquid level changes both in wavelength and phase. The cross sensitivity of the sensor to refractive index and temperature was also studied.application/pdfeng© 2017 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 works.Optical fiber transducersOptical interferometryPhase measurementSMS structureinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess