Optical Phase Refractometer Based on Post-Processed Interferometric Tip Sensors

• Tipo: Artigo em Revista Científica Internacional
• Data: 2014

Autores

Marta S Ferreira (Autor) Outra; Joerg Bierlich (Autor) Outra; Sonja Unger (Autor) Outra; Kay Schuster (Autor) Outra; Jose L Santos (Autor) FCUP; Orlando Frazao (Autor) FCUP

Revista

Título: Journal of Lightwave Technology

Vol. 32

Páginas: 3002-3007

ISSN: 0733-8724

Editora: Optical Society of America

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 4 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia electrotécnica, electrónica e informática

Outras Informações

ID Authenticus: P-009-R1B

DOI: 10.1109/jlt.2014.2335272

Abstract (EN): An interferometric tip sensor based on the post-process of a special design double-cladding optical fiber is proposed. Due to the sensing head design, it is sensitive to environmental variations. In order to analyze this effect, the sensing head is subjected to temperature variations both in liquid and gas (at 1 atm). Comparing the two signals, it is possible to discriminate the contribution of the liquid refractive index variation with temperature. Not only the amplitude of the signal varies with the surrounding medium, but also the phase of the interferometric pattern alters. This is due to the presence of a thin diaphragm at the end face of the fiber structure turning the sensing head in a three wave interferometric device. An indirect measurement of the water refractive index is performed, by subjecting the sensing head to temperature variations in air and water. Even though the sensitivities obtained are lower than the ones reported in the literature, it should be highlighted that there is no core exposition of the fiber to the external medium. The sensor is easy to fabricate, robust, and reproducible.

Idioma: Inglês

Tipo (Avaliação Docente): Científica