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Sensors 2010, 10(11), 10105-10127; doi:10.3390/s101110105

Feasibility of Fiber Bragg Grating and Long-Period Fiber Grating Sensors under Different Environmental Conditions

1
Department of Construction Engineering, National Yunlin University of Science and Technology, Douliou 64002, Taiwan
2
Department of Physics, National Chung Cheng University, Chia-Yi 62102, Taiwan
*
Authors to whom correspondence should be addressed.
Received: 22 October 2010 / Revised: 3 November 2010 / Accepted: 8 November 2010 / Published: 10 November 2010
(This article belongs to the Special Issue Advanced Sensing Technology for Nondestructive Evaluation)

Abstract

This paper presents the feasibility of utilizing fiber Bragg grating (FBG) and long-period fiber grating (LPFG) sensors for nondestructive evaluation (NDE) of infrastructures using Portland cement concretes and asphalt mixtures for temperature, strain, and liquid-level monitoring. The use of hybrid FBG and LPFG sensors is aimed at utilizing the advantages of two kinds of fiber grating to implement NDE for monitoring strains or displacements, temperatures, and water-levels of infrastructures such as bridges, pavements, or reservoirs for under different environmental conditions. Temperature fluctuation and stability tests were examined using FBG and LPFG sensors bonded on the surface of asphalt and concrete specimens. Random walk coefficient (RWC) and bias stability (BS) were used for the first time to indicate the stability performance of fiber grating sensors. The random walk coefficients of temperature variations between FBG (or LPFG) sensor and a thermocouple were found in the range of −0.7499 °C/ to −1.3548 °C/. In addition, the bias stability for temperature variations, during the fluctuation and stability tests with FBG (or LPFG) sensors were within the range of 0.01 °C/h with a 15–18 h time cluster to 0.09 °C/h with a 3–4 h time cluster. This shows that the performance of FBG or LPFG sensors is comparable with that of conventional high-resolution thermocouple sensors under rugged conditions. The strain measurement for infrastructure materials was conducted using a packaged FBG sensor bonded on the surface of an asphalt specimen under indirect tensile loading conditions. A finite element modeling (FEM) was applied to compare experimental results of indirect tensile FBG strain measurements. For a comparative analysis between experiment and simulation, the FEM numerical results agreed with those from FBG strain measurements. The results of the liquid-level sensing tests show the LPFG-based sensor could discriminate five stationary liquid-levels and exhibits at least 1,050-mm liquid-level measurement capacity. Thus, the hybrid FBG and LPFG sensors reported here could benefit the NDE development and applications for infrastructure health monitoring such as strain, temperature and liquid-level measurements.
Keywords: nondestructive evaluation (NDE); fiber Bragg grating (FBG); long-period fiber grating (LPFG); temperature, strain; liquid-level; finite element model; random walk coefficient nondestructive evaluation (NDE); fiber Bragg grating (FBG); long-period fiber grating (LPFG); temperature, strain; liquid-level; finite element model; random walk coefficient
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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

Wang, J.-N.; Tang, J.-L. Feasibility of Fiber Bragg Grating and Long-Period Fiber Grating Sensors under Different Environmental Conditions. Sensors 2010, 10, 10105-10127.

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