Banca de DEFESA: RAONI DE FREITAS GÓIS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : RAONI DE FREITAS GÓIS
DATE: 29/02/2024
TIME: 09:00
LOCAL: Sessão por videoconferência.
TITLE:

PROPOSALS OF TRANSDUCING CONFIGURATIONS FOR OPTICAL FIBER SENSORS OPERATING UNDER RETRO-REFLECTION.

KEY WORDS:

SPR. Optimization. Experimental. 3D  impression. Alignment. Retro-reflection.

PAGES: 106
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:

In this work, two transducer configurations are investigated for the development of optical fiber sensors capable of operating in retroreflection mode. In the first configuration, the potential gains in sensitivity of fiber sensors for detecting interfaces between immiscible liquids are explored by adding one or more layers of thin films to the tip of the optical fiber. In comparison with a bare tip fiber sensor, the deposition of a gold film can improve the sensitivity by 13-fold. A transducer interface with multiple dielectric layers, can improve the sensitivity by 19,5-fold. In a second configuration, the use of metalized diffraction gratings under the effect of Surface Plasmon Resonance (SPR) for the fabrication of fiber sensors coupled in retroreflection mode is investigated. This configuration has the potential to achieve sensitivities 25,000 times greater than that of a bare fiber tip sensor. An experimental arrangement was implemented using an aluminum grating coupled to the cleaved tip of an optical fiber. With this configuration, experimental schemes were developed to apply the sensor system in the SPR spectrum characterization and in the implementation of a sensor capable of determining the ambient dew point.

COMMITTEE MEMBERS:
Presidente - 1131199 - EDUARDO FONTANA
Externo à Instituição - GUSTAVO OLIVEIRA CAVALCANTI - UPE
Externo à Instituição - JOAO BATISTA ROSOLEM - CPQD
Interno - 2226204 - JOAQUIM FERREIRA MARTINS FILHO
Interno - 2199776 - RENATO EVANGELISTA DE ARAUJO