Abstract
We report the development of a fiber Bragg grating (FBG) sensor for multiparameter sensing using only one FBG. The FBG was half-embedded in a 3D-printed structure, which resulted in a division of the grating spectrum creating two peaks with different sensitivities with respect to different physical parameters. A numerical analysis of the proposed technique was performed using the coupled-mode theory with modified transfer matrix formulation. Then, experimental analyses were performed as function of temperature, strain and force, where the peaks showed different sensitivities in all analyzed cases. Such results enable the application of a technique for simultaneous measurement of multiple physical parameters using both peaks and the full width half maximum of the FBG embedded in a 3D structure. In the simultaneous multiparameter assessment, the proposed sensor system was able to estimate the three tested parameters (strain, temperature and force) with relative errors as low as 4%.
Highlights
Since their first report in 1978 [1], fiber Bragg gratings (FBGs) have experienced a continuous growth on applications such as fiber lasers, dispersion compensation, band-rejection filters and wavelength selective devices as summarized in [1]
The FBGs are half-embedded in a 3D-printed structure, which results in a division of the grating spectra, where the two resultant peaks and the full width half maximum (FWHM) have different sensitivities to physical parameters
The thermoplastic polyurethane (TPU) structure with half-embedded FBG is positioned on a linear translation stage and the spectral behavior is verified half-embedded FBG is positioned on a linear translation stage and the spectral behavior is verified under low strain condition
Summary
Since their first report in 1978 [1], fiber Bragg gratings (FBGs) have experienced a continuous growth on applications such as fiber lasers, dispersion compensation, band-rejection filters and wavelength selective devices as summarized in [1]. Advantages like compactness, lightweight, chemical stability, electromagnetic immunity, multiplexing capabilities and wavelength-encoded data have led to the rapid widespread of FBG sensors in different application fields, e.g., industrial processes [3], structural health monitoring [4], biomedical [5] and robotics [6] In such applications, FBGs can be embedded in different materials and structures to measure strain and temperature, and liquid level [7], humidity [8] and force [6]. Considering this background, this paper proposes the application ALM techniques on the development of multiparameter sensors using FBGs. The FBGs are half-embedded in a 3D-printed structure, which results in a division of the grating spectra, where the two resultant peaks and the full width half maximum (FWHM) have different sensitivities to physical parameters. One can envisage this technique being used in applications where a multitude of sensors is required or when a multiple parameters have to be measured in micrometer resolution
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