scholarly journals Preliminary View of a Smart Technique for Materials Testing in the Laboratory using FBG Sensor

2018 ◽  
Vol 203 ◽  
pp. 04001
Author(s):  
Isah W. Balarabe ◽  
Mohamad Hisham ◽  
Ahmad R. Niraku ◽  
Indra S.H. Harahap
Keyword(s):  
High Resolution ◽  
Bragg Grating ◽  
Materials Testing ◽  
Fibre Bragg Grating ◽  
Fbg Sensor ◽  
Perfect Correlation ◽  
Fbg Sensors

Simple experiments for calibrating Fibre Bragg Grating (FBG) in order to measure strain and temperature have been successfully demonstrated in this study. This will allow convenient use of FBG sensor in the laboratory for measuring quantities. Linear curve fittings were employed for both the strain and temperature, and R2 values are determined respectively. The result showed a perfect correlation between FBG, strain and temperature. The approach can be employed with ease, simplicity in an inexpensive manner, in order harness the advantages offered by FBG sensors such as accuracy, precision, speed and high resolution.

Investigation on Temperature Compensation of Fiber Bragg Grating Sensors for Hull Monitoring

2018 ◽  
Author(s):  
Ruiqi Ma ◽  
Guoqing Feng ◽  
Huilong Ren ◽  
Peng Fu ◽  
Shuang Wu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Fiber Bragg Grating ◽  
Temperature Compensation ◽  
Compensation Method ◽  
Bragg Grating ◽  
Theoretical Derivation ◽  
Temperature Changes ◽  
Hull Girder ◽  
Fbg Sensor ◽  
Fbg Sensors

Hull monitoring system with Fiber Bragg Grating (FBG) sensors increasingly receives people’s attentions. However, for the ship hull monitoring, the deformation of hull girder changes a lot as is subjected to a huge temperature variation. Therefore, the compensation method with only FBG temperature self-correction is not suitable for the hull monitoring sensors because no material thermal expansion effects are reasonably included. In this paper, the new compensation method of hull monitoring FBG sensor based on the sensor theory with both FBG temperature self-correction and steel thermal expansion effects correction is studied. The coupled compensation method suitable for hull monitoring sensor is obtained by theoretical derivation. As the comparison, the coupled compensation experiment was carried out. The results show that the relative error under the temperature compensation method is large in the case of drastic strain and temperature changes, and the correction results of the tested method will be closer to the true level.

Detection of Pipeline Curvature with FBG Sensors Twisted

2013 ◽  
Vol 303-306 ◽  
pp. 67-73 ◽  
Author(s):  
Yan An Zhang ◽  
Zheng Liu ◽  
Lin Yong Shen ◽  
Jin Wu Qian
Keyword(s):  
Fiber Bragg Grating ◽  
Curve Fitting ◽  
Bragg Grating ◽  
Bending Deformation ◽  
Fbg Sensor ◽  
Underground Pipelines ◽  
Fbg Sensors ◽  
Simulation Results ◽  
Spatial Trajectory ◽  
Fitting Accuracy

In trenchless detection of underground pipelines, a method has been introduced which employs Fiber Bragg Grating (FBG) sensors to detect curvatures of the pipeline at discrete points and reconstructs the spatial trajectory of the pipeline by means of a newly developed approach. In measuring the pipeline curvature, the FBG sensor may be twisted besides sustaining bending deformation. This paper proposes a new algorithm for curvature calculation at discrete points, considering both overall revolving and partial twisting of the FBG sensors in order to enhance the curve fitting accuracy. Simulation results verify the effectiveness of the method.

scholarly journals Model of the Temperature Influence on Additively Manufactured Carbon Fibre Reinforced Polymer Samples with Embedded Fibre Bragg Grating Sensors

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 222
Author(s):  
Torkan Shafighfard ◽  
Magdalena Mieloszyk
Keyword(s):  
Numerical Simulation ◽  
Composite Structures ◽  
Thermal Loading ◽  
Elevated Temperatures ◽  
Mechanical Strain ◽  
Experimental Investigations ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Reinforced Polymer ◽  
Fbg Sensors

This study investigates the thermo-mechanical behaviour of additively manufactured Carbon Fiber Reinforced Polymer (CFRP) with embedded Fibre Bragg Grating (FBG) sensors with respect to their feasibility for utilising them under thermal loading. This was conducted through the Finite Element Method (FEM) inside an ABAQUS environment. Numerical simulation was complemented by several experimental investigations in order to verify the computational results achieved for the specimens exposed to thermal loading. FBG sensors, incorporated into the material by embedding technique, were employed to measure the strains of the samples subjected to elevated temperatures. It was shown that the strains given by numerical simulation were in good agreement with the experimental investigation except for a few errors due to the defects created within the layers during Additive Manufacturing (AM) process. It was concluded that the embedding FBG sensors were capable of identifying thermo-mechanical strain accurately for 3D-printed composite structures. Therefore, the findings of this article could be further developed for other types of material and loading conditions.

scholarly journals Fatigue Crack Propagation Monitoring Using Fibre Bragg Grating Sensors

Vibration ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 700-721
Author(s):  
Magdalena Mieloszyk
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Acoustic Waves ◽  
Crack Detection ◽  
Bragg Grating ◽  
Alloy Sample ◽  
Fibre Bragg Grating ◽  
Propagation Process ◽  
Crack Propagation Process ◽  
Fbg Sensors

The paper presents the analysis of the possibility of fatigue crack detection and monitoring its propagation process using fibre Bragg grating (FBG) sensors. The investigations were carried out on an aluminium alloy sample (a part of the Mi-2 helicopter rotor blade). During the fatigue test, the sample was equipped with FBG sensors applied for strain measurement and the vibration-based strain monitoring. It was observed that the strain curves determined by the FBG sensors agreed well with the fatigue force profile. However, the strain curves were almost insensitive to the crack propagation process, except in the last stage of the test, when the crack length was equal to 25 mm. The strain values and the natural frequencies of the sample that were determined experimentally were compared with the values achieved from the finite element method model, with both methods showing good agreement. Additionally, spectrogram-based analyses were performed, focused on the acoustic waves phenomena related to a crack propagation process. It was confirmed that the proposed signal processing method, based on spectrogram analyses, can be applied for the detection of fatigue crack development in metal structures.

Fracture Monitoring of Composite Wind Turbine Blade Using High-Speed Bragg Grating Sensor System

2011 ◽  
Vol 109 ◽  
pp. 79-83 ◽  
Author(s):  
Hyung Joon Bang ◽  
Soo Hyun Kim
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
High Speed ◽  
Performance Test ◽  
Turbine Blades ◽  
Wind Turbine Blade ◽  
Sensor System ◽  
Bragg Grating ◽  
Fbg Sensor ◽  
Fbg Sensors

This paper introduces a FBG (fiber Bragg grating) based AE (acoustic emission) sensing system for use in health monitoring of composite wind turbine blades. In this study, a multiplexing high speed FBG sensor system was developed with a spectrometer-type demodulator based on a linear photo detector. Pencil break test was performed using an FBG sensor and the results were compared with the results of piezo-based AE sensor. For the performance test of fracture sensing in composite materials, a down-scaled wind turbine blade was fabricated and drop impact tests were performed. Arrayed 4 FBG sensors were installed in the skin of wind turbine blade and impacts of 15 J energy were applied by a drop weight. The frequency characteristics of impact induced AE signals were examined with short-time Fourier transform focused on the leading waves. Finally, the onset of fractures in composite structure was successfully assessed using arrayed FBG sensors.

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