slope supporting structure have shown significant sensor. The main structure of the strain sensor cracks and deformation, as shown in Figure 1. includes steel pipes for pasting the Bragg grating, a flange for fixing the sensor, self-locking nuts for fixing the armored cable, and so on. When the strain sensors are buried in the strain pile, the flange is firmly fixed in the mortar of the strain pile so that the flange can make the fiber Bragg grating strained in the axial direction. The center wavelength shift of the wf a se c ro B nr n ae g cg t ed to the main control room; the server d afo c uw is t ion and analysis on the data sent by sensors. The server was able to be remotely accessed th rough the network for checking the stability of the s eΛ i s uh c monitoringof the structural stabilityof the mountain

2015 ◽  
pp. 397-399
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Sensor ◽  
Axial Direction ◽  
Strain Sensors ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Main Structure ◽  
Steel Pipes ◽  
Supporting Structure ◽  
The Stability

Spring-Steel Pipe Fiber Bragg Grating Strain Sensor

2014 ◽  
Vol 620 ◽  
pp. 233-237
Author(s):  
Li Peng ◽  
Chuan Li ◽  
Zhen Gang Zhao ◽  
Sheng Wu ◽  
Ying Na Li
Keyword(s):  
Fiber Bragg Grating ◽  
Axial Strain ◽  
Strain Sensor ◽  
Optical Loss ◽  
Spring Steel ◽  
Steel Pipe ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Repeatability Error ◽  
The Stability

Structure’s strain reflects the stability of the project, the excessive structural strain will destroy the stability of the structure. Fiber Bragg Grating has many features, such as, strong anti-interference ability, low optical loss, and it can be used for a long time in the project, etc. Base on the features, the Fiber Bragg Grating Strain Sensor can be used in slope and other projects for the long-term monitoring. In this paper, we develop a Fiber Bragg Grating Strain Sensor based on the spring-steel pipe, FBG be fixed to the inner of the steel pipe by epoxy glue, it is protected by a stainless steel pipe outside, the Flange be fixed to the both side of the spring-steel pipe. When the tension acting one the flanges, the spring-steel pipe occurs an axial strain, this axial strain makes the center wavelength of the Fiber Bragg Grating change, measuring the wavelength shift amount of the Fiber Bragg Grating can calculate the strain. The loading experiment indicates that the sensitivity of the Spring-steel pipe Fiber Bragg Grating Strain Sensor is 0.81pm/με, the linearity of the sensor is 2.1%FS, and the repeatability error of the sensor is 2.29%FS.

FBG Strain Sensor for Monitoring Daily Wind Direction Change on Power Tower Cross Arm Deformation Effects

2013 ◽  
Vol 645 ◽  
pp. 334-337
Author(s):  
Zhen Li Xue ◽  
Xiao Yong Chen ◽  
Zhou Chun Cai ◽  
Chuan Li ◽  
Zhen Gang Zhao
Keyword(s):  
Fiber Bragg Grating ◽  
Wind Direction ◽  
Strain Sensor ◽  
Strain Range ◽  
Internal Force ◽  
Strain Sensors ◽  
Bragg Grating ◽  
The Cross ◽  
Mean Strain ◽  
Main Material

Under the influence of ice coating and other natural factors, Power tower cross arm will deform, damage and even fracture with the increasing stress. On the power tower of Yanjin converting station, four fiber Bragg grating strain sensors were installed. By changing the internal force that main material of the cross arm suffered, deflection change of each main material occurred, resulting in fiber Bragg grating wavelength of the fiber Bragg grating strain sensors which on the surface of the cross arm shifting. During the 479 days monitoring, the # 2 sensor daily mean strain range is the largest with the value of 1700.98, while the 3 # sensors have the smallest value of 1122.91. On the July 20th 2011, daily mean strain of the 2# strain sensor located in the insulation cross arm reached the maximum value 382.01, while on the February 19th 2011, that of the 4# sensor achieved the minimum value -1477.75.On the February 19th 2011, both local wind direction and speed had the biggest changes through the testing process, which indicates that the cable sweeping wind is the mainly reason to cause the power tower cross arm deformation.

The Comparison and Analysis of Fiber Grating Strain Sensor and Resistance Strain Slice for Transmission Tower Vibration Monitoring

2014 ◽  
Vol 533 ◽  
pp. 211-213
Author(s):  
Jin Feng Geng ◽  
Dong Fang Ma ◽  
Hong Sheng Cai ◽  
Wen Tao Wu ◽  
Jun Wei Dong ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Resistance Strain ◽  
Vibration Monitoring ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Transmission Tower ◽  
Existing Problems ◽  
Tower Vibration

Contrast advantages and existing problems of resistance strain slice and fiber grating strain sensor for tower vibration strain monitoring, compare the structure of the two, and do the on-site installation and experiments, analyze the monitoring data. It can make a conclusion that the properties of fiber bragg grating strain sensors are basic consistent with resistance strain slice. And fiber bragg grating strain sensors can be used for transmission tower vibration monitoring .

scholarly journals Efficient Sensor Placement Optimization for Shape Deformation Sensing of Antenna Structures with Fiber Bragg Grating Strain Sensors

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2481 ◽  
Author(s):  
Jinzhu Zhou ◽  
Zhiheng Cai ◽  
Pengbing Zhao ◽  
Baofu Tang
Keyword(s):  
Fiber Bragg Grating ◽  
Sensor Placement ◽  
Strain Sensor ◽  
Reconstruction Error ◽  
Strain Sensors ◽  
Shape Deformation ◽  
Bragg Grating ◽  
Antenna Structure ◽  
Displacement Sensors ◽  
Sensor Locations

This paper investigates the problem of an optimal sensor placement for better shape deformation sensing of a new antenna structure with embedded or attached Fiber Bragg grating (FBG) strain sensors. In this paper, the deformation shape of the antenna structure is reconstructed using a strain–displacement transformation, according to the measured discrete strain data from limited FBG strain sensors. Moreover, a two-stage sensor placement method is proposed using a derived relative reconstruction error equation. In this method, the initial sensor locations are determined using the principal component analysis based on orthogonal trigonometric (i.e., QR) decomposition, and then a new location is sequentially added into the initial sensor locations one by one by minimizing the relative reconstruction error considering information redundancy. The numerical simulations are conducted, and the comparisons show that the proposed method is advantageous in terms of the sensor distribution and computational cost. Experimental validation is performed using an antenna experimental platform equipped with an optimal FBG strain sensor configuration, and the reconstruction results show good agreements with those measured directly from displacement sensors. The proposed method has a large potential for the strain sensor placement of complex structures, and the proposed antenna structure with FBG strain sensors can be applied to the future wing-skin antenna or flexible space-based antenna.

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