Abstract
A technique to enhance the spatial resolution of typical fiber Bragg grating–based strain gauges has been experimentally verified in this study. Just analyzing the intensity of the reflection spectrum of a sampled fiber Bragg grating, its inner deformation profile has been obtained with a spatial resolution of [Formula: see text] L<1mm. The proposed method employs a synthesis algorithm to retrieve the longitudinal axis strain profile of a sampled fiber Bragg grating glued to an asymmetric plate. The achieved experimental results have been compared to the mechanical simulations of the employed plate, exhibiting a good response even without compensating the residual stress provoked during the installation process.
Highlights
Optical fiber sensors [1] have been widely applied to measure a wide set of different measurands on materials and structures [2]
For most of the reported applications, each sensing point (FBG) is reported as the integrated measurand value along the whole Fiber Bragg Gratings based transducers (FBGs) structure. This kind of transducers have a typical length of few millimeters, that works for many scenarios but, sometimes, the axial strain distribution within the FBG structure can be required
The Sampled Fiber Bragg Grating (SFBG) was manufactured in a standard telecommunications optical fiber with the phase mask technique using a continuous laser emitting at 244 nm
Summary
Optical fiber sensors [1] have been widely applied to measure a wide set of different measurands on materials and structures [2]. Fiber Bragg Gratings based transducers (FBGs) highlight over other optical techniques when measuring mechanical deformations [3] Their multiplexing capabilities, where several sensing points can be concatenated in a fiber to give rise to quasi-distributed fiber sensors, enable this technology to monitor large working structures such as bridges [4, 5] and even to be employed in biomedical applications [6]. Several approaches have been proposed to obtain the deformation profile along the FBG structure, but most of them require phase measurements of the reflection spectrum [7, 8] or a-priori knowledge of the strain distribution [9,10,11] These requirements increase the complexity of the sensor system, reduce the final dynamic response and, limit its use in potential real applications
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