Journal ArticleDOI
An all-fibre multi-parameter sensor for composite structures based on a chirped fibre Bragg grating
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TLDR
An all-fibre multi-parameter sensor for composite structures based on a chirped optical fibre Bragg grating (CFBG) has been studied theoretically and experimentally.Abstract:
An all-fibre multi-parameter sensor for composite structures based on a chirped optical fibre Bragg grating (CFBG) has been studied theoretically and experimentally. The principle of multi-parameters sensing with a single CFBG is based on that the centre wavelength and the FWHM (full width at half maximum) in the reflection spectrum of a CFBG vary linearly with the temperature and/or the axial stress. A wavelength matched optical fibre long period grating (LPG) and another wavelength matched reference CFBG (CFBGR) have been used to interrogate the signal of the sensor CFBG (CFBGS). The temperature and strain of the composite structure have been monitored real-time with one CFBG as a single sensor head. The temperature resolution of 0.12°C and the strain resolution of 1.1μɛ for a composite structure have been realized in experiments. The experiment results agree well with the theoretical analyses.read more
Citations
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Journal ArticleDOI
Miniature fiber-optic sensor for simultaneous measurement of pressure and refractive index
Simon Pevec,Denis Donlagic +1 more
TL;DR: A micromachining process based on selective chemical etching of specially designed phosphorus-doped fibers, and a sequence of splice and cleave steps were used to fabricate the sensor.
Journal ArticleDOI
Inverse problem of determining periodic surface profile oscillation defects of steel materials with a fiber Bragg grating sensor.
Sławomir Cięszczyk,Piotr Kisała +1 more
TL;DR: Direct measurement of the spectral reflectance characteristics of the fiber is performed, and the related inverse problem of indirect defect shape determination is solved and it has been demonstrated that the defect periodicity estimation is 2.5 mm, with an error of less than 0.1.
Journal ArticleDOI
Chirped fiber Bragg grating written in highly birefringent fiber in simultaneous strain and temperature monitoring.
TL;DR: A new sensor configuration is proposed for simultaneous strain and temperature monitoring in a composite material that is based on a chirped fiber Bragg grating written in a highly birefringent polarization-maintaining fiber.
Journal ArticleDOI
Single-core multi-channel moiré fiber grating and multi-wavelength LMA fiber grating fabricated based on two-dimensional spatially encoded phase mask
TL;DR: In this paper, a two-dimensional optical fiber grating with multi sub-gratings based on a 2D spatially encoded phase mask is designed, which can improve the optical fiber refractive index modulation from one- to two- or even three-dimensions.
References
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Proceedings ArticleDOI
Fiber Optic Bragg Grating Sensors
TL;DR: In this paper, the authors describe a new method to generate Bragg grating filters in germania-doped communication fibers and discuss their applications as sensors, which are formed by exposing a short section of the core, through the side of the fiber, to an interference pattern of intersecting coherent beams of UV light.
Journal ArticleDOI
Damage detection and assessment in fibre-reinforced composite structures with embedded fibre optic sensors-review
TL;DR: In this article, a state-of-the-art review of the research and development of in situ fiber optic damage detection and assessment systems (FODDAS) embedded in fiber-reinforced composite structures is presented.
Journal ArticleDOI
Structural health monitoring of smart composite materials by using EFPI and FBG sensors
TL;DR: In this paper, the extrinsic Fabry-Perot interferometer (EFPI) and fiber Bragg grating (FBG) sensors are real-time employed to simultaneously monitor the cure process of CFRP composite laminates with and without damage.
Journal ArticleDOI
Discrimination methods and demodulation techniques for fiber Bragg grating sensors
Yong Zhao,Yanbiao Liao +1 more
TL;DR: In this article, a comprehensive and systematic overview of discrimination measurement methods and demodulation techniques for fiber-bragg grating (FBG) sensors is presented, and a differential FBG sensor for simultaneous measurement of downhole high pressure and temperature is introduced.
Journal ArticleDOI
Cure monitoring of smart composites using Fiber Bragg Grating based embedded sensors
Abstract: A sensor embedded in the composite laminate can act as a temperature transducer during the composite cure mechanism. Once the composite is cured, the same sensor can be used to provide the information about the mechanical changes that influence the performance of the material. Fiber Bragg Grating (FBG) sensor is one such sensor which one can use for the composite cure monitoring. We present here the results obtained with an associated FBG sensor system for the cure monitoring of smart composites. The performance of the embedded FBG sensor smart composite specimens under 3- and 4-point bending conditions are also being investigated. Finally, the performance analysis has been extended to cantilever specimens.