Fibre optic hot-wire flowmeter based on a metallic coated hybrid LPG-FBG structure

P. Caldas; P. A. S. Jorge; G. Rego; O. Frazão; J. L. Santos; L. A. Ferreira; F. Araújo

doi:10.1117/12.866463

8 September 2010 Fibre optic hot-wire flowmeter based on a metallic coated hybrid LPG-FBG structure

P. Caldas, P. A. S. Jorge, G. Rego, O. Frazão, J. L. Santos, L. A. Ferreira, F. Araújo

Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 76530B (2010) https://doi.org/10.1117/12.866463
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal

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.

Citation Download Citation

P. Caldas, P. A. S. Jorge, G. Rego, O. Frazão, J. L. Santos, L. A. Ferreira, and F. Araújo "Fibre optic hot-wire flowmeter based on a metallic coated hybrid LPG-FBG structure", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76530B (8 September 2010); https://doi.org/10.1117/12.866463

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