Concentration sensor based on a tilted fiber Bragg grating for anions monitoring

Melo, Luis; Rodrigues, João; Farinha, Andreia S.F.; Marques, Carlos; Bilro, Lúcia; Alberto, Nélia; Tomé, João P. C.; Nogueira, Rogério N.

doi:10.1016/j.yofte.2014.05.002

Cited by 64 publications

(15 citation statements)

References 30 publications

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“…More details about this method can be found in Melo et al [20] The results, presents in Fig. 5, were normalized using as reference the value obtained for the case of the grating immersed in distilled water (RI= 1.3320).…”

Section: Characterization Of the Go-coated Tfbgs To Ri Variationsmentioning

confidence: 99%

Characterization of Graphene Oxide Coatings onto Optical Fibers for Sensing Applications

Alberto

Vigário

Duarte

et al. 2015

Materials Today: Proceedings

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Section: Characterization Of the Go-coated Tfbgs To Ri Variationsmentioning

confidence: 99%

Characterization of Graphene Oxide Coatings onto Optical Fibers for Sensing Applications

Alberto

Vigário

Duarte

et al. 2015

Materials Today: Proceedings

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“…The advantages of sensors with fiber Bragg gratings (FBGs) have led to their high popularity and extended their field of application [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. These advantages can be divided into two groups.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of Matched Filter Interrogation of FBG Sensors with Large Side Lobes

Skorupski

Cięszczyk

Panas

et al. 2020

Sensors

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This article presents the effect of fiber Bragg gratings side lobes on interrogation systems consisting of sensor and matched filters. The conducted research shows that high-value side lobe structures applied as sensors and/or filters are characterized by some interesting properties. The paper presents both numerical analysis and experimental verification of the fiber Bragg gratings (FBG) interrogation systems with matched filters for gratings containing high side lobes. Numerical modeling of Bragg structures was performed for two different cases: uniform and inverse apodization. Modification of apodization can change the side lobe reflectance level even above levels found in uniform structures. This is a case not described in the literature, especially in terms of possible applications. Transfer characteristics, i.e., the relationship between power intensity as a function of wavelength shift, were determined. A collection of gratings with spectra corresponding to those analyzed in numerical experiments were fabricated. Next, the transfer characteristics of the interrogation systems containing real FBG were determined. The properties of the proposed systems are described. It has been shown that a significant level of sidebands, which is often the subject of many drawbacks in filtering or telecommunications systems, can be an advantage. It has been demonstrated that a high level of side lobes can be used to increase the measurement range of the FBG sensor interrogation systems. It has been determined numerically and confirmed experimentally that from the point of view of the design of sensor interrogation systems, it is beneficial to combine specific pairs of gratings: one with a spectrum characterized by a low side lobe level and a second one in which the spectrum has very high side lobes.

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“…Indeed, Bragg gratings photo-inscribed in polymer optical fibres (POFs) are more sensitive to temperature and pressure than their silica counterparts because of their larger thermo-optic coefficient and smaller Young’s modulus [ 5 , 6 ]. In chemistry, by a tilted fibre Bragg grating sensor, you can investigate individual detection of different anion concentrations [ 7 ]. A silica fibre Bragg grating has the potential to be applied in tunable optical filters and tunable cavities for photonic application.…”

Section: Introductionmentioning

confidence: 99%

Fibre Bragg Gratings for the Monitoring of Wooden Structures

2017

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The aim of this work was to develop and validate an experimental methodology suitable for analysing on-site the behaviour of fibre-reinforced wooden structures. The proposed measurement method is based on the application of fibre Bragg grating (FBG) strain sensors. An analysis of adhesive behaviour was performed preliminarily, which provided indications for choosing the type of adhesive and for the fibre bonding length in accordance with the volume of measurement. The first series of tests was carried out on wood samples to verify the coupling between the measuring sensor and the wood support when the latter is subject to mechanical stresses. The second investigation was done on site to test the behaviour of a historical wood floor before and after reinforcement by means of a series of tests performed using optical fibres with the Bragg grating. The optical fibre system measurements were compared to those obtained using a laser vibrometer, a measurement system of proven stability and precision. The comparison makes it possible to confirm the validity of the results and the reliability of the system for the monitoring of historic wooden structures.

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Concentration sensor based on a tilted fiber Bragg grating for anions monitoring

Cited by 64 publications

References 30 publications

Characterization of Graphene Oxide Coatings onto Optical Fibers for Sensing Applications

Characterization of Graphene Oxide Coatings onto Optical Fibers for Sensing Applications

Numerical and Experimental Analysis of Matched Filter Interrogation of FBG Sensors with Large Side Lobes

Fibre Bragg Gratings for the Monitoring of Wooden Structures

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