scholarly journals Application of a Novel Long-Gauge Fiber Bragg Grating Sensor for Corrosion Detection via a Two-level Strategy

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 954 ◽  
Author(s):  
Yuyao Cheng ◽  
Chenyang Zhao ◽  
Jian Zhang ◽  
Zhishen Wu
Keyword(s):  
Fiber Bragg Grating ◽  
Corrosion Damage ◽  
Structural Monitoring ◽  
Strain Gauges ◽  
Bragg Grating ◽  
Damage Location ◽  
Fbg Sensors ◽  
Level 1 ◽  
Bragg Grating Sensor ◽  
Level 2

Corrosion of main steel reinforcement is one of the most significant causes of structuraldeterioration and durability reduction. This research proposes a two-level detection strategy tolocate and quantify corrosion damage via a new kind of long-gauge fiber Bragg grating (FBG) sensor.Compared with the traditional point strain gauges, this new sensor has been developed for bothlocal and global structural monitoring by measuring the averaged strain within a long gauge length.Based on the dynamic macrostrain responses of FBG sensors, the strain flexibility of structures areidentified for corrosion locating (Level 1), and then the corrosion is quantified (Level 2) in terms ofreduction of sectional stiffness of reinforcement through the sensitivity analysis of strain flexibility.The two-level strategy has the merit of reducing the number of unknown structural parametersthrough corrosion damage location (Level 1), which guarantees that the corrosion quantification(Level 2) can be performed efficiently in a reduced domain. Both numerical and experimentalexamples have been studied to reveal the ability of distributed long-gauge FBG sensors for corrosionlocalization and quantification.

Research on Fiber Bragg Grating Sensor Monitoring Method for Dynamical Stress of Centrifugal Blower Vane

2011 ◽  
Vol 383-390 ◽  
pp. 5222-5226
Author(s):  
Zhi Xin Hu ◽  
Yun Bin Ma ◽  
Shuai Huan ◽  
Yu Chun Zhen
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Centrifugal Blower ◽  
Monitoring Method ◽  
Rotating Speed ◽  
Rotary Joint ◽  
Fbg Sensors ◽  
Bragg Grating Sensor ◽  
Sensor Monitoring ◽  
Dynamical Stress

Monitoring method for dynamical stress of centrifugal blower vane based on Fiber Bragg Grating (FBG) sensing technique is presented in this paper. Consisting of FBG sensors, FBG interrogator and fiber optic rotary joint, this monitoring system has bare FBG as strain sensor, monitors stresses at the inlet and outlet of the centrifugal blower. Details about stick up method of FBG sensors are shown in this paper, either. In addition, this method has been applied to experimental model of centrifugal blower, and it was found that: stress at the outlet of the air vane is more than that at the inlet; within the working range, stress of air vane increases in company with increment of rotating speed, though it is not linear relation between them.

Identification of damage location in advanced grid structures using fiber Bragg grating sensor

2005 ◽  
Author(s):  
Masataro Amano ◽  
Ichiya Takahashi ◽  
Yoji Okabe ◽  
Nobuo Takeda ◽  
Hajime Takeya ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Damage Location ◽  
Bragg Grating Sensor

Method of damage location determination based on a neural network using a single fiber Bragg grating sensor

2019 ◽  
Vol 58 (26) ◽  
pp. 7251 ◽  
Author(s):  
Bangtian Xu ◽  
Xuezhi Zhang ◽  
Junfeng Jiang ◽  
Kun Liu ◽  
Shuang Wang ◽  
...  
Keyword(s):  
Neural Network ◽  
Fiber Bragg Grating ◽  
Fiber Bragg Grating Sensor ◽  
Single Fiber ◽  
Bragg Grating ◽  
Damage Location ◽  
Location Determination ◽  
Bragg Grating Sensor

LOAD CELL DESIGN USING FIBER BRAGG GRATING SENSORS

2012 ◽  
Vol 06 ◽  
pp. 203-208 ◽  
Author(s):  
Dong Jin Park ◽  
Min Kyu Kang ◽  
Jong Hyun Lee ◽  
Seok Soon Lee ◽  
Hyo Seok Jung
Keyword(s):  
Fiber Bragg Grating ◽  
Sea Water ◽  
Offshore Structures ◽  
Load Cell ◽  
Strain Gauges ◽  
Bragg Grating ◽  
Electromagnetic Environment ◽  
Electrical Method ◽  
Fbg Sensors ◽  
Electro Magnetic

A load cell is the representative converter that changes load to the quantity of electricity. The load cell is used to a large mechanical structure and offshore structures to measure the force. Currently, the load cell using electrical strain gauges are commonly used. Basic measuring principle of electrical strain gauge is the electrical method. A load cell with electrical strain gauges is not available in the electromagnetic and corrosion environment. A Fiber Bragg Grating (FBG) sensor is not affected by the EMI (Electro Magnetic Interference)/EMC (Electro Magnetic Compatibility) and is strong in corrosion under the sea water. In this paper, we use the FBG sensors to make a load cell under the sea water condition and the electromagnetic environment and show FBG sensors' availability.

Monitoring of a Steel Plate Girder Railroad Bridge with Fiber Bragg Grating Sensors

2006 ◽  
Vol 321-323 ◽  
pp. 264-267 ◽  
Author(s):  
Won Seok Chung ◽  
Dong Hoon Kang ◽  
Eun Soo Choi ◽  
Hyun Min Kim
Keyword(s):  
Fiber Bragg Grating ◽  
Steel Plate ◽  
Dynamic Responses ◽  
Structural Monitoring ◽  
Bragg Grating ◽  
Bottom Flange ◽  
Vertical Deflection ◽  
Railroad Bridge ◽  
Fbg Sensors ◽  
Plate Girder

This study investigates an existing steel plate girder railroad bridge in order to monitor static and dynamic responses using fiber Bragg grating (FBG) sensors. This paper also presents an experimental technique to estimate the vertical deflection of the bridge using FBG sensors. Seven FBG sensors are multiplexed in a single optical fiber and installed in parallel pairs along the length of the bridge, with one set on the top flange and the other on the bottom flange. The train passes over the bridge at different speeds, ranging from 10 km/h to 90 km/h, so as to monitor the dynamic response of the bridge. The results show that the proposed instrumentation technique is capable of estimating the deflection of the bridge for various loading conditions, which is crucial in structural monitoring.

Measurement of pile load transfer using the Fiber Bragg Grating sensor system

2004 ◽  
Vol 41 (6) ◽  
pp. 1222-1232 ◽  
Author(s):  
Woojin Lee ◽  
Won-Je Lee ◽  
Sang-Bae Lee ◽  
Rodrigo Salgado
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Axial Load ◽  
Load Transfer ◽  
Optical Fiber Sensor ◽  
Sensor System ◽  
Fiber Sensor ◽  
Bragg Grating ◽  
Fbg Sensors ◽  
Bragg Grating Sensor

A series of laboratory and field tests were performed to evaluate the applicability of an optical fiber sensor system in the instrumentation of piles. A multiplexed sensor system, constructed by arranging several Fiber Bragg Grating (FBG) sensors along a single line of optical fiber, is capable of measuring local axial strains as a function of wavelength shifts. The distributions of axial load in three model piles and a field test pile evaluated from the strains measured by FBG sensors are found to be comparable, in terms of both magnitude and trend, with those obtained from conventional strain gauges. This suggests that the FBG sensor system is an effective tool for the analysis of the axial load transfer in piles. The successful instrumentation of a soil–cement injected precast (SIP) pile using FBG sensors suggests that the use of these sensors in drilled shafts and other types of cast in situ concrete piles is feasible. With the rapid advance of optical fiber sensor technology, the economics of the use of optical fiber sensors in this type of instrumentation is expected to improve significantly in coming years.Key words: pile foundation, load transfer, fiber optic sensor, Fiber Bragg Grating sensor.

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