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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 17 — Jun. 10, 2011
  • pp: 2738–2743

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

Paulo Caldas, Pedro A. S. Jorge, Gaspar Rego, Orlando Frazão, José Luís Santos, Luís Alberto Ferreira, and Francisco Araújo  »View Author Affiliations

Applied Optics, Vol. 50, Issue 17, pp. 2738-2743 (2011)

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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 1480 nm 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 0.08 m / s is achieved using this new configuration.

© 2011 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: December 6, 2010
Manuscript Accepted: April 5, 2011
Published: June 9, 2011

Paulo Caldas, Pedro A. S. Jorge, Gaspar Rego, Orlando Frazão, José Luís Santos, Luís Alberto Ferreira, and Francisco Araújo, "Fiber optic hot-wire flowmeter based on a metallic coated hybrid long period grating/fiber Bragg grating structure," Appl. Opt. 50, 2738-2743 (2011)

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