scholarly journals STRUCTURAL SHAPE RECONSTRUCTION WITH CONSIDERATION OF BOUNDARY CONDITION CHANGES USING DISTRIBUTED OPTICAL FIBER STRAIN SENSOR

2010 ◽  
Vol 66 (2) ◽  
pp. 229-238
Author(s):  
Mayuko NISHIO ◽  
Nobuo TAKEDA
Keyword(s):  
Boundary Condition ◽  
Optical Fiber ◽  
Strain Sensor ◽  
Shape Reconstruction ◽  
Structural Shape ◽  
Distributed Optical Fiber

scholarly journals Reaching pε/√Hz sensitivity in a distributed optical fiber strain sensor

2018 ◽  
Author(s):  
Luis Costa ◽  
Hugo F. Martins ◽  
Sonia Martin-Lopez ◽  
María R. Fernández-Ruiz ◽  
Miguel Gonzalez-Herraez
Keyword(s):  
Optical Fiber ◽  
Strain Sensor ◽  
Distributed Optical Fiber

Distributed optical fiber strain sensor based on a novel microbend structure

2000 ◽  
Author(s):  
Aidong Meng ◽  
Fei Luo ◽  
Naibin Ma ◽  
Shengfang Yuan
Keyword(s):  
Optical Fiber ◽  
Strain Sensor ◽  
Distributed Optical Fiber

A Surface Strain Monitoring Technique for Slope of Mountainous Area Substation Based on FBG Sensor

2014 ◽  
Vol 1030-1032 ◽  
pp. 992-998
Author(s):  
Ming Yao Hu ◽  
Da Da Wang ◽  
Hong Liang Wang ◽  
Zheng Gang Zhao ◽  
Ying Na Li ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Strain Sensor ◽  
Surface Strain ◽  
Mountainous Area ◽  
Maximum Strain ◽  
Slope Surface ◽  
Fiber Sensing ◽  
Downstream Slope ◽  
Optical Fiber Sensing ◽  
Distributed Optical Fiber

Geological structure health in mountainous area substation is complex, and the climate is changeable, it is easy to appear the geological disasters like landslide and subsidence in substation, Aiming at the strong electromagnetic interference in substation and other factors, to monitor of slope surface strain of mountainous area substation with FBG strain sensor, in order to reflect the stability of the slope. Combined with the actual situation of slope of Yunnan 220kV mountainous area substation, the surface type FBG strian sensors are installed on the surface of upstream and downstream slope of mountainous area substation, the lower reaches of the substation, the serial network forms a quasi distributed optical fiber sensing network. they form a quasi-distributed optical fiber sensing network through the serial networking methods.When the slope surface occurs deformation due to the soil sliding, it will drive the FBG strain sensor and transfer the equal strain to the FBG strain sensor. By measuring the center wavelength shift of the FBG strian sensor, the strian value of slope surface at each point can be reflected. The monitoring results show that, the period from May 9th to June 6th, the maximum strain of upstream slope is 171uɛ, it appears at the location of marked as US4 FBG strain sensor, the maximum strain of downstream slope is 112uɛ,it appears at the location of marked as DS1 FBG strain sensor.

scholarly journals Fully Distributed Optical Fiber Strain Sensor With 10−12 ϵ/√Hz Sensitivity

2019 ◽  
Vol 37 (18) ◽  
pp. 4487-4495 ◽  
Author(s):  
Luis Costa ◽  
Hugo F. Martins ◽  
Sonia Martin-Lopez ◽  
Maria R. Fernandez-Ruiz ◽  
Miguel Gonzalez-Herraez
Keyword(s):  
Optical Fiber ◽  
Strain Sensor ◽  
Distributed Optical Fiber

scholarly journals Long-Term Monitoring of a Tunnel in a Landslide Prone Area by Brillouin-Based Distributed Optical Fiber Sensors

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7032
Author(s):  
Aldo Minardo ◽  
Ester Catalano ◽  
Agnese Coscetta ◽  
Giovanni Zeni ◽  
Caterina Di Maio ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Brillouin Scattering ◽  
Strain Sensor ◽  
Fiber Sensors ◽  
Prone Area ◽  
Fiber Deformation ◽  
Active Landslide ◽  
Italian Apennines ◽  
Distributed Optical Fiber ◽  
Stimulated Brillouin

This paper shows the results of the monitoring of the deformations of a tunnel, carried out using a distributed optical fiber strain sensor based on stimulated Brillouin scattering. The artificial tunnel of the national railway crosses the accumulation zone of an active landslide, the Varco d’Izzo earthflow, in the southern Italian Apennines. Severely damaged by the landslide movements, the tunnel was demolished and rebuilt in 1992 as a reinforced concrete box flanked by two deep sheet pile walls. In order to detect the onset of potentially dangerous strains of the tunnel structure and follow their time trend, the internal deformations of the tunnel are also monitored by a distributed fiber-optic strain sensor since 2016. The results of the monitoring activity show that the deformation profiles are characterized by strain peaks in correspondence of the structural joints. Furthermore, the elongation of the fiber strands crossing the joints is consistent with the data derived by other measurement systems. Experiments revealed an increase in the time rate of the fiber deformation in the first and last part of the monitoring period when the inclinometers of the area also recorded an acceleration in the landslide movements.

Distributed optical fiber bi-directional strain sensor for gas trunk pipelines

2001 ◽  
Vol 36 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Chuan Li ◽  
Yi-mo Zhang ◽  
Tie-gen Liu ◽  
Xin Li ◽  
Xi-ming Cheng
Keyword(s):  
Optical Fiber ◽  
Strain Sensor ◽  
Distributed Optical Fiber
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