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Proceedings Paper

Fibre optic hot-wire flowmeter based on a metallic coated hybrid LPG-FBG structure
Author(s): P. Caldas; P. A. S. Jorge; G. Rego; O. Frazão; J. L. Santos; L. A. Ferreira; F. Araújo
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Paper Abstract

In this work an all optical hot-wire flowmeter based on a silver coated fibre incorporating a long period grating and a Bragg grating is demonstrated. Optical energy at 1480 nm propagating down the fibre is coupled by the long period grating into the fibre cladding and absorbed by the metallic coating deposited on the fibre surface over the Bragg grating position. This absorption acts like a hot-wire raising locally the fibre temperature, which is effectively detected by the FBG resonance shift. The temperature raise depends on the flow speed of the surrounding air that has the effect to cool the fibre. In this way, the FBG Bragg wavelength shift can be related with the flow speed. Results obtained demonstrate the working principle and a flow speed resolution of 0.08 m/s is demonstrated.

Paper Details

Date Published: 8 September 2010
PDF: 4 pages
Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76530B (8 September 2010); doi: 10.1117/12.866463
Show Author Affiliations
P. Caldas, INESC Porto (Portugal)
Univ. do Porto (Portugal)
Escola Superior de Tecnologia e Gestão (Portugal)
P. A. S. Jorge, INESC Porto (Portugal)
G. Rego, INESC Porto (Portugal)
Escola Superior de Tecnologia e Gestão (Portugal)
O. Frazão, INESC Porto (Portugal)
J. L. Santos, INESC Porto (Portugal)
Univ. do Porto (Portugal)
L. A. Ferreira, INESC Porto (Portugal)
F. Araújo, INESC Porto (Portugal)


Published in SPIE Proceedings Vol. 7653:
Fourth European Workshop on Optical Fibre Sensors
José Luís Santos; Brian Culshaw; José Miguel López-Higuera; William N. MacPherson, Editor(s)

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