Strain monitoring of dual-room box-girder during prestressing tension based on fiber Bragg grating sensor

2012 ◽  
Author(s):  
Dansheng Wang ◽  
Tao Jin ◽  
Hongping Zhu ◽  
Weiping He ◽  
Ming Li
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Box Girder ◽  
Strain Monitoring ◽  
Bragg Grating Sensor

Research on Temperature Compensation of the Fiber Bragg Grating Sensor and the Resistance Strain Gauge

2021 ◽  
Vol 16 (6) ◽  
pp. 1020-1027
Author(s):  
Feng Zhu ◽  
Min Liu ◽  
Chengjun Xu ◽  
Sheng Zou ◽  
Chentong Chen ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Gauge ◽  
Temperature Compensation ◽  
Metal Structure ◽  
Resistance Strain ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Resistance Strain Gauge ◽  
Strain Monitoring ◽  
Bragg Grating Sensor

The fiber Bragg grating sensor is widely used in strain monitoring of large metal structure and trend to replace the resistance strain gauge due to its advantages of strong stability, high measurement accuracy, multiple points measuring, strong environmental suitability and long transmission distance. The temperature-induced strain, which can have the same order of magnitudes as the mechanically-induced strain, will cause great errors in the strain monitoring. Therefore, the temperature compensation for the sensors is essential to guarantee the measurement accuracy. The existing theoretical models and experiment platforms for analyzing the temperature compensation are established by assuming that the testing temperature is constant. However, the surrounding temperature of some large metal structure is not stable, and the effect of temperature change cannot be neglected. This paper aims to establish an analytic model and an experiment platform to compare the temperature compensation of the fiber bragg grating sensor and the resistance strain gauge. The superiority of the temperature compensation for the fiber bragg grating sensor is verified. The result provides theoretical support for choosing the fiber bragg grating sensor in the long-time strain monitoring.

scholarly journals Ultrahigh Resolution Multiplexed Fiber Bragg Grating Sensor for Crustal Strain Monitoring

2012 ◽  
Vol 4 (3) ◽  
pp. 996-1003 ◽  
Author(s):  
Q. Liu ◽  
T. Tokunaga ◽  
K. Mogi ◽  
H. Matsui ◽  
H. F. Wang ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Ultrahigh Resolution ◽  
Crustal Strain ◽  
Strain Monitoring ◽  
Bragg Grating Sensor

Four years of soil strain monitoring on Etna Volcano Mount by means of a Three-axial Fiber Bragg Grating Sensor

2020 ◽  
Author(s):  
Umberto Giacomelli ◽  
Enrico Maccioni ◽  
Giorgio Carelli ◽  
Daniele Carbone ◽  
Salvatore Gambino ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
High Performance ◽  
Low Cost ◽  
High Sensitivity ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Strain Behavior ◽  
Strain Monitoring ◽  
Soil Strain ◽  
Bragg Grating Sensor

<p>Rock strains detection is one of the principal ways to monitor geohazards. Classic strainmeters are cumbersome, hard to install and very expensive. Opto-electronics devices based on fiber Bragg grating technology allow to realize strainmeters with high sensitivity, low-cost, small volume and high performance.<br>We present the long term result of continuous soil strain monitoring on the Etna mount by a three-axial fiber Bragg grating sensor. The sensor has been developed in the framework of European Project MED-SUV (MEDiterranean SUpersite Volcanos). The installation site is a 8.5 meters deep borehole at a distance of about 7 km South-West from the summit craters of the Etna mount, at an elevation of about 1740 meters. This kind of sensor has a resolution better than 100 nanostrains on a daily timescale. Despite it is only a prototype, the sensor has worked for four years with a duty-cycle higher than 90% detecting both fast event, as earthquakes, and slow event, as epochal rocks strain behavior.</p>

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