City Research Online

Abstract

This paper proposes a novel detection scheme simultaneously to measure strain and temperature, based on a simple to construct device using a section of a specially designed few mode fiber (FMF). The parameters and index profile of the FMF used as the key sensor element are such that the fiber supports only the LP01 and LP02 modes, δβ, has a maximum corresponding to the critical wavelength (CWL) in the fiber transmission spectrum. Because the two peaks located closest to the CWL from both sides, Left Peak 1 and Right Peak 1, shift in opposite directions, with different sensitivities under axial strain and temperature variations, the FMF device is capable of measuring the strain and temperature simultaneously. A theoretical analysis has been carried out as part of the design process and the experimental results obtained are found to agree well with the theoretical predictions. The characteristics of this sensor scheme is discussed in light of other competing approaches to simultaneous temperature and strain monitoring and is found to show advantages which suit several practical applications including compactness, ease of fabrication and implementation, relatively high sensitivities and low cost.

Publication Type:	Article
Additional Information:	© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publisher Keywords:	Fiber optics sensor, few mode fiber, intermodal interference, critical wavelength, strain sensor, temperature sensor
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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