Fibre Optic Hot-Wire Flowmeter Based on a Metallic Coated Hybrid LPG-FBG Structure

• Type: Article in International Conference Proceedings Book
• Date: 2010

Authors

Caldas, P (Author) Other; Jorge, PAS (Author) FCUP; Rego, G (Author) Other; Frazao, O (Author) FCUP; Santos, JL (Author) FCUP; Ferreira, LA (Author) Other; Araujo, F (Author) Other

Conference proceedings International

Title: FOURTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS

Fourth European Workshop on Optical Fibre Sensors

Porto, PORTUGAL, SEP 08-10, 2010

Indexing

ISI Web of Knowledge - 1 Citation

ISI Web of Science

Scopus - 3 Citations

Scientific classification

FOS: Engineering and technology > Electrical engineering, Electronic engineering, Information engineering

Other information

Authenticus ID: P-003-AZG

DOI: 10.1117/12.866463

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific