An Extrinsic Fabry-Perot Interferometer-Based Large Strain Sensor with High Resolution

Abstract

A three-layer packaged structure is proposed for an extrinsic Fabry-Perot interferometer-based optical fiber sensor in order to produce high resolution for large strains. The resolutions of three data processing algorithms including interference frequency tracking, period tracking and phase tracking are investigated and compared. Laboratory tests indicate that the proposed sensor structure can measure a strain of up to ±120 000 με (±12%) with resolution as high as 10 με. The sensor prototype is insensitive to fiber misalignment, enabling the study of progressive structural failures with an integrated use of the three algorithms.

Department(s)

Civil, Architectural and Environmental Engineering

Second Department

Electrical and Computer Engineering

Keywords and Phrases

Extrinsic Fabry-Perot Interferometer (EFPI); High Resolution; Large Strain Measurement; Strain Sensor; Structural Health Monitoring; Data Processing; Fiber Optic Sensors; Fracture Mechanics; Monitoring; Optical Fibers; Optical Instruments; Strain Gages

International Standard Serial Number (ISSN)

0957-0233

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2010 IOP Publishing Ltd., All rights reserved.

Publication Date

01 Oct 2010

Link to Full Text

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