scholarly journals Cantilever Beam with a Single Fiber Bragg Grating to Measure Temperature and Transversal Force Simultaneously

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2002
Author(s):  
Abdulfatah A. G. Abushagur ◽  
Norhana Arsad ◽  
Ahmad Ashrif A. Bakar
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Calibration System ◽  
Temperature Variations ◽  
Temperature Changes ◽  
Fbg Sensor ◽  
The Matrix ◽  
Transversal Force ◽  
Future Work ◽  
Calibration Coefficients

This work investigates a new interrogation method of a fiber Bragg grating (FBG) sensor based on longer and shorter wavelengths to distinguish between transversal forces and temperature variations. Calibration experiments were carried out to examine the sensor’s repeatability in response to the transversal forces and temperature changes. An automated calibration system was developed for the sensor’s characterization, calibration, and repeatability testing. Experimental results showed that the FBG sensor can provide sensor repeatability of 13.21 pm and 17.015 pm for longer and shorter wavelengths, respectively. The obtained calibration coefficients expressed in the linear model using the matrix enabled the sensor to provide accurate predictions for both measurements. Analysis of the calibration and experiment results implied improvements for future work. Overall, the new interrogation method demonstrated the potential to employ the FBG sensing technique where discrimination between two/three measurands is needed.

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.

The Vibration Analysis of a Novel Vortex Flowmeter Based on Fiber Bragg Grating

2012 ◽  
Vol 485 ◽  
pp. 526-531 ◽  
Author(s):  
Hui Juan Dong ◽  
Yong Cai ◽  
Jun He ◽  
Ren Bing Liu
Keyword(s):  
Fiber Bragg Grating ◽  
Vibration Analysis ◽  
Axial Strain ◽  
Damping Ratio ◽  
Bragg Grating ◽  
Measuring Range ◽  
Fbg Sensor ◽  
Vortex Flowmeter ◽  
Acrylic Glass ◽  
Mass Spring

A novel fiber Bragg grating vortex flowmeter was designed in this work, where the Bragg grating was enfolded in a cylinder eddy generator. Bragg grating subject to force and the corresponding strain were analyzed. Subsequently, the relationships between grating’s axial strain and flow were developed. In order to improve the flowmeter's resolution, the system was simplified by a mass-spring-damper model, which was used to analyze resonance and choose acrylic glass as cylinder's material. In terms of the resolution of FBG sensor demodulation device and factors of vortex's formation, the measuring range of flowmeter is 1200L/h~5000L/h. The resolution is less than 40L/h with flow exceeding 2000L/h. The damping ratio is not sensitive to the flow when it is less than 2000L/h.

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.

Application of Fiber Bragg Grating Technology in Spacecraft Structural Fault Detection

2019 ◽  
Vol 14 (12) ◽  
pp. 1725-1732
Author(s):  
Xingyu Zheng
Keyword(s):  
Fault Detection ◽  
Fiber Bragg Grating ◽  
Fault Location ◽  
Measurement Model ◽  
Angle Measurement ◽  
Thin Plates ◽  
Bragg Grating ◽  
Structural Failure ◽  
Fbg Sensor ◽  
Structural Problems

With the prolongation of the service life of spacecraft, the structural failure of spacecraft caused by air resistance and aging poses a direct threat to the safe operation of spacecraft. The structural failure of aircraft is concerned by many researchers. Among them, the fiber Bragg grating (FBG) sensor has become a hotspot of aircraft structural fault research because of its good performance. Facing the difficulties of structural fault location of traditional spacecraft, slow data updating speed and poor transplant ability of positioning device, a structural fault angle measurement model based on FBG strain flower is constructed by combining FBG sensor with the principle of right-angle strain flower. On the problem of determining the main strain orientation, two groups of FBG strain rosette locations are selected to determine, and different groups of locations are cross-solved to obtain the original coordinates of impact. At the same time, aiming at the structural problems of four simple thin plates in the aircraft, a method of judging the structural load based on the disturbance trend is proposed. In the process of experiment, it is necessary to test the positioning accuracy of the structure obtained by the sensor and the size error of the load. In order to better simulate the real scene, a simulation platform of aircraft structure impact is built. During the testing process, it is found that the sensor detection platform proposed in this study can locate structural faults within 2.8 cm. The average time required for location judgment is about 1.7 ms, and the error of structural impact force is about 2.86 N. Through this study, a new detection method for structural fault detection of spacecraft is proposed, which can better ensure the safety of spacecraft.

Experiment and Research of Using Fiber Bragg Grating to Monitor the Dynamic Response of Asphalt Concrete

2011 ◽  
Vol 97-98 ◽  
pp. 301-304 ◽  
Author(s):  
Ke Li ◽  
Jian Guang Xie
Keyword(s):  
Dynamic Response ◽  
Fiber Bragg Grating ◽  
Asphalt Concrete ◽  
High Speed ◽  
Load Test ◽  
Bragg Grating ◽  
Static Load Test ◽  
Practical Applications ◽  
Fbg Sensor ◽  
On The Road

Based on the fiber Bragg grating sensing technology, a FBG sensor is designed to monitor the dynamic response of asphalt concrete; the sensitivity coefficient of FBG sensor is 1.28pm/με. Through the static load test, the correlation between strain and wavelength variation is 0.1797µε/pm, after second packaged and embedded in SMA-13 asphalt concrete. The instantaneous impact on the road of high-speed vehicles is simulated by using drop hammer. The results are shown that the Sensor can satisfy the requirements of practical applications and succeed in monitoring the dynamic response of asphalt concrete. The monitored signal can reflect the viscoelastic-plastic deformation law of asphalt concrete. The sensor can be used to monitor the dynamic response of asphalt concrete.

Simulation and Experiment of Pressure Pipeline Weakness Monitoring Based on Optical Fiber Bragg Grating

2014 ◽  
Vol 487 ◽  
pp. 517-521
Author(s):  
Yue Ming Liu ◽  
Zhong Cheng Xia ◽  
Xiao Liang Gao
Keyword(s):  
Fiber Bragg Grating ◽  
Power Plants ◽  
Electrical Power ◽  
Bragg Grating ◽  
Ansys Software ◽  
Fbg Sensor ◽  
Pressure Pipeline ◽  
Simulation And Experiment ◽  
Novel Method ◽  
Explosion Accidents

Pressure pipelines have been applied widely in the chemical industry, the petroleum enterprises and the electrical power plants. Leakage and explosion accidents happened frequently owing to the weakness of the pressure pipeline. To monitoring the pressure pipeline weakness, a novel method is presented by using optical FBG (FBG: Fiber Bragg Grating) sensors to carry on the real-time monitoring of the pressure piping surface strains. A typical pressure pipeline was fabricated with weak position of L shaped, Tee shaped and U shaped joints. The strains of the weak position were analyzed by the ANSYS software, and then the same weak positions were monitored by experimental method of FBG sensor. The FBG sensor was verified a feasible means to monitoring the pressure pipeline by comparing the ANSYS software results with the experimental results of FBG sensors.

scholarly journals A High Sensitive Micro-Seismic Fiber Bragg Grating(FBG) Sensor System

2011 ◽  
Vol 26 ◽  
pp. 765-771
Author(s):  
Jin-Yu Wang ◽  
Guang-Dong Song ◽  
Xiao-Hui Liu ◽  
Chang Wang ◽  
Tong-Yu Liu
Keyword(s):  
Fiber Bragg Grating ◽  
Sensor System ◽  
Bragg Grating ◽  
Fbg Sensor

scholarly journals Dual-parameter sensing characteristics of a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing

2021 ◽  
Vol 51 (3) ◽  
Author(s):  
Hong Li ◽  
Haoyue Zhang ◽  
Yanming Song ◽  
Fanyong Meng ◽  
Lianqing Zhu
Keyword(s):  
Fiber Bragg Grating ◽  
Experimental System ◽  
Single Fiber ◽  
Bragg Grating ◽  
Curing Conditions ◽  
Fbg Sensor ◽  
Novel Technology ◽  
Sensor Structure ◽  
Narrow Space ◽  
Sensing Characteristics

A novel technology for the simultaneous and independent measurement of dual parameters is proposed and experimented. By using a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing conditions, the sensor structure is designed such that the reflective single-peak spectrum splits into a twin-peak spectrum, which makes the FBG spectrum form a natural spectral peak splitting bias. A measurement limitation exists in the FBG sensor packaging at room temperature, which can be solved by the high-temperature cured packaging method. To verify the validity of the theory and methodology, the experimental system is used. In the range from –1000 to +1000 με and from 35 to 75°C, the Bragg wavelength change is relative linear to the strain and temperature. The temperature and strain variations can be independently and simultaneously measured using the split peak, and the deviations of the FBG sensor are ±1°C and ±5 με, respectively. This single FBG sensor can realize dual-parameter measurement, which is valuable for narrow-space health monitoring.

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