Fiber modal Michelson interferometers with coherence addressing and heterodyne interrogation

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Paulo Caldas (Autor) Outra; Pedro A S Jorge (Autor) FCUP; Araujo, FM (Autor) Outra; Luis A Ferreira (Autor) Outra; Manuel B Marques (Autor) FCUP; Gaspar Rego (Autor) Outra; Jose Luis Santos (Autor) FCUP

Revista

Título: Optical Engineering

Vol. 47

Página Final: 044401

ISSN: 0091-3286

Editora: SPIE

Indexação

ISI Web of Knowledge - 15 Citações

Scopus - 21 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-004-0P3

DOI: 10.1117/1.2903089

Abstract (EN): A long-period-grating-based fiber optic Michelson modal interferometer with coherence addressing and heterodyne interrogation is studied as a sensing structure for measuring environmental refractive index, temperature, and liquid level. The effects of several system parameters on the measurements are investigated. Experimental results show that the sensitivity to the external refractive index increases with the order of cladding mode and with a reduction of the fiber diameter. The decrease of the fiber diameter from 125 mu m down to 70 mu m enhances the sensitivity to the external index by a factor of 2.7. It is also shown that the use of a silica-core fiber increases the sensitivity to the external index by a factor of 1.4 and reduces the thermal sensitivity by a factor of 2.5 compared to a standard fiber. (C) 2008 Society of Photo-Optical Instrumentation Engineers.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7