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Sensors 2013, 13(9), 11476-11489; doi:10.3390/s130911476

A Noncontact Force Sensor Based on a Fiber Bragg Grating and Its Application for Corrosion Measurement

Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marquês de São Vicente 225, Rio de Janeiro, RJ 22451-900, Brazil
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Received: 22 July 2013 / Revised: 16 August 2013 / Accepted: 27 August 2013 / Published: 29 August 2013
(This article belongs to the Special Issue Photonic Sensors for Industrial, Environmental and Health Monitoring)
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Abstract

A simple noncontact force sensor based on an optical fiber Bragg grating attached to a small magnet has been proposed and built. The sensor measures the force between the magnet and any ferromagnetic material placed within a few millimeters of the sensor. Maintaining the sensor at a constant standoff distance, material loss due to corrosion increases the distance between the magnet and the corroded surface, which decreases the magnetic force. This will decrease the strain in the optical fiber shifting the reflected Bragg wavelength. The measured shift for the optical fiber used was 1.36 nm per Newton. Models were developed to optimize the magnet geometry for a specific sensor standoff distance and for particular corrosion pit depths. The sensor was able to detect corrosion pits on a fuel storage tank bottom with depths in the sub-millimeter range. View Full-Text
Keywords: fiber Bragg grating; magnetic force sensor; photonic force sensor; internal corrosion fiber Bragg grating; magnetic force sensor; photonic force sensor; internal corrosion
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Pacheco, C.J.; Bruno, A.C. A Noncontact Force Sensor Based on a Fiber Bragg Grating and Its Application for Corrosion Measurement. Sensors 2013, 13, 11476-11489.

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