Research and application of fiber Bragg grating safety monitoring method for huge structures and equipments

2010 ◽  
Author(s):  
Desheng Jiang ◽  
Kajia Che ◽  
Ciming Zhou ◽  
Jun Huang ◽  
Dian Fan
Keyword(s):  
Fiber Bragg Grating ◽  
Safety Monitoring ◽  
Bragg Grating ◽  
Monitoring Method

Deflection monitoring method for two-dimensional structure based on fiber Bragg grating sensors measurements

2019 ◽  
Author(s):  
Pasquale Di Palma ◽  
Giovanna Palumbo ◽  
Massimo Della Pietra ◽  
Vincenzo Canale ◽  
Mariagrazia Alviggi ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Dimensional Structure ◽  
Bragg Grating ◽  
Two Dimensional ◽  
Monitoring Method ◽  
Fiber Bragg Grating Sensors

scholarly journals Derrick safety monitoring system based on fiber Bragg grating strain sensors

2013 ◽  
Vol 3 (3) ◽  
pp. 237-240 ◽  
Author(s):  
Yang Cheng ◽  
Xianglin Lu ◽  
Yuan Gong ◽  
Yu Wu ◽  
Yunjiang Rao
Keyword(s):  
Fiber Bragg Grating ◽  
Monitoring System ◽  
Safety Monitoring ◽  
Strain Sensors ◽  
Bragg Grating ◽  
Safety Monitoring System

scholarly journals An Fiber Bragg Grating-Based Monitoring System for Slope Deformation Studies in Geotechnical Centrifuges

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1591 ◽  
Author(s):  
Lei Zhang ◽  
Bin Shi ◽  
Luigi Zeni ◽  
Aldo Minardo ◽  
Honghu Zhu ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Monitoring System ◽  
Slope Failure ◽  
Retaining Wall ◽  
Bragg Grating ◽  
Sliding Surface ◽  
Monitoring Method ◽  
Geotechnical Centrifuge ◽  
Centrifuge Tests ◽  
Depth Analysis

Centrifugal model tests, which can reproduce the deformation process of the slope, play a crucial role in investigating the mechanism of slope failure. The FBG-based sensors, with high precision, electromagnetic resistance, light weight and small size, have been introduced into geotechnical centrifuge monitoring. The slope evolution is a complex multi-parameter dynamic process which involves the interaction of displacement, stress and strain. However, current research is mainly focused on one or two monitoring aspects, i.e., strain or displacement monitoring to study some specific questions. To achieve multi-parameter and real-time monitoring, a comprehensive fiber Bragg grating (FBG) monitoring system including miniaturized anchors, earth pressure gauges, inclinometer pipe and retaining wall, has been designed for geotechnical centrifuge tests. Before the centrifugal test, laboratory calibrations of sensors were carried out. The calibration results indicate that the FBG-based sensors can monitor the strain, stress and displacement variation precisely. The multi-parameter information related to slope stability were captured and analyzed in detail. The stress state of the anchors, strain distribution of retaining wall together with the displacement of the inclinometer pipe indicate the progressive evolutionary process of the model slope. The test results also indicate that the critical centrifugal force for the transition of the sliding surface is 45 g, after which, a sliding surface is formed in the soil above the retaining wall. The feasibility and validity of the monitoring system is verified by a comparison between the results of FBG-based sensors and those of a numerical simulation. In summary, the innovative FBG-based monitoring system has provided a feasible multi-parameter monitoring method in geotechnical centrifugal tests so as to facilitate further in-depth analysis.

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.

Study of Fiber Bragg Grating Sensor in Dam Safety Monitoring

2013 ◽  
Vol 312 ◽  
pp. 736-740 ◽  
Author(s):  
Ying Xiang Luo
Keyword(s):  
Fiber Bragg Grating ◽  
High Speed ◽  
Optical Network ◽  
High Capacity ◽  
Safety Monitoring ◽  
Optical Fiber Communication ◽  
Bragg Grating ◽  
Dam Safety ◽  
Fiber Communication ◽  
Dam Safety Monitoring

As Optical fiber communication technology is developing towards high-speed and high-capacity, continual evolution to the all-optical network. In the lead of the mushroom development of Optical communication, Fiber Bragg Grating (FBG) is become one of the most mushroom optical passive components. This article will discuss about application of Fiber Bragg grating (FBG) sensor in dam safety monitoring, to improve the management and maintenance of dam.

Mobile-distributed seepage monitoring method based on fiber Bragg grating sensing technology

Sensor Review ◽  
2018 ◽  
Vol 38 (3) ◽  
pp. 345-352
Author(s):  
Jiang Chen ◽  
Junli Zheng ◽  
Feng Xiong
Keyword(s):  
Fiber Bragg Grating ◽  
Monitoring System ◽  
Spatial Resolution ◽  
Bragg Grating ◽  
Monitoring Methods ◽  
Seepage Velocity ◽  
Monitoring Method ◽  
Content Type ◽  
Sensing Technology ◽  
Tube Structure

PurposeThe spatial resolution of seepage monitoring methods based on fiber Bragg grating (FBG) temperature sensing technology is limited by the distance between measurement points. Improving the spatial resolution for a given number of measurement points is a prerequisite for popularizing this technology in the seepage monitoring of rockfill dams. The purpose of this paper is to address this problem.Design/methodology/approachThis paper proposes a mobile-distributed seepage monitoring method based on the FBG-hydrothermal cycling seepage monitoring system. In this method, the positions of the measurement points are changed by freely dragging the FBG sensing cluster within the inner tube of a dual-tube structure, consisting of an inner polytetrafluoroethylene tube and outer polyethylene of raised temperature resistance heating tube.FindingsA seepage velocity calibration test was carried out using the improved monitoring system. The results showed that under a constant seepage velocity, the use of the dual-tube structure enables faster cooling, and the cooling rate accelerates with an increase in the diameter of the inner tube. The use of the dual-tube structure can improve the sensitivity of the seepage evaluation indexζvto the seepage velocity. When the inner diameter increases,ζvbecomes more sensitive to the seepage velocity.Originality/valueA mobile-distributed seepage monitoring method based on FBG sensing technology is proposed in which the FBG sensors are not fixed. Instead, the positions of the measurement points are changed to improve the spatial resolution. Meanwhile, the use of the dual-tube structure in the presented monitoring system can improve its sensitivity.

Local Temperature Monitoring Method of a Rotor Using Near-Infrared Fiber Bragg Grating

2020 ◽  
pp. 13-24
Author(s):  
Rita Abboud ◽  
Hani Al Hajjar ◽  
Alejandro Ospina ◽  
Jad Abou Chaaya ◽  
Youssef Zaatar ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Near Infrared ◽  
Temperature Monitoring ◽  
Local Temperature ◽  
Bragg Grating ◽  
Monitoring Method
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