Fiber optic hot-wire flowmeter based on a metallic coated hybrid long period grating/fiber Bragg grating structure

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Paulo Caldas (Autor) Outra; Pedro A S Jorge (Autor) FCUP; Gaspar Rego (Autor) FCUP; Orlando Frazao (Autor) FCUP; Jose Luis Santos (Autor) FCUP; Luis Alberto Ferreira (Autor) Outra; Francisco Araujo (Autor) Outra

Revista

Título: Applied Optics

Vol. 50

Páginas: 2738-2743

ISSN: 1559-128X

Editora: Optical Society of America

Indexação

ISI Web of Knowledge - 73 Citações

Scopus - 78 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-002-QGM

DOI: 10.1364/ao.50.002738

Abstract (EN): In this work an all-optical hot-wire flowmeter based on a silver coated fiber combining a long period grating and a fiber Bragg grating (FBG) structure is proposed. Light from a pump laser at 1480nm propagating down the fiber is coupled by the long period grating into the fiber cladding and is absorbed by the silver coating deposited on the fiber surface over the Bragg grating structure. This absorption acts like a hot wire raising the fiber temperature locally, which is effectively detected by the FBG resonance shift. The temperature increase depends on the flow speed of the surrounding air, which has the effect of cooling the fiber. It is demonstrated that the Bragg wavelength shift can be related to the flow speed. A flow speed resolution of 0.08m/s is achieved using this new configuration. (C) 2011 Optical Society of America

Idioma: Inglês

Tipo (Avaliação Docente): Científica