scholarly journals Optical Fiber Sensor Experimental Research Based on the Theory of Bending Loss Applied to Monitoring Differential Settlement at the Earth-Rock Junction

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Jianchun Qiu ◽  
Dongjian Zheng ◽  
Kai Zhu ◽  
Bin Fang ◽  
Lin Cheng
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Single Mode ◽  
Differential Settlement ◽  
The Body ◽  
Fiber Sensor ◽  
Monitoring Device ◽  
The Earth ◽  
Bending Loss ◽  
Sensor Monitoring

Considering the differential settlement in the junction between the structure perpendicular to the dike and the body and foundation of dike (called the earth-rock junction in this paper) during runtime, an experimental investigation of optical fiber sensor monitoring was conducted. Based on the sensing mechanism of single-mode optical fiber bending loss, the experiment focused on the influence of the bending radius of an optical fiber on the bending loss. In view of the characteristics of the differential settlement in the earth-rock junction, we designed a butterfly-type optical fiber sensor and composite optical fiber sensor for monitoring device in monitoring the differential settlement to enlarge the monitoring range and improve the sensibility of optical fiber sensor. Based on the research on the working principle and bending properties of the composite optical fiber monitoring device, we conducted experiments on the bending of the composite optical fiber sensor monitoring device and the use of the device for monitoring the differential settlement. These experiments verified the feasibility of the composite optical fiber sensor monitoring device at monitoring the differential settlement in the earth-rock junction.

Optical fiber sensor monitoring fault gas based on modulated fiber grating model filter

1999 ◽  
Author(s):  
Xingguo Wu ◽  
Shaohui Li ◽  
Gang Zhang ◽  
Zhipeng Zhang ◽  
Yuanzhong Xu
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Fiber Grating ◽  
Fault Gas ◽  
Model Filter ◽  
Sensor Monitoring

Refractive index and temperature sensing characteristics of an optical fiber sensor based on a tapered single mode fiber/polarization maintaining fiber

2016 ◽  
Vol 14 (5) ◽  
pp. 050604-50608
Author(s):  
Zaihang Yang Zaihang Yang ◽  
Hao Sun Hao Sun ◽  
Tingting Gang Tingting Gang ◽  
Nan Liu Nan Liu ◽  
Jiacheng Li Jiacheng Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Temperature Sensing ◽  
Fiber Sensor ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Sensing Characteristics

Single-mode D-shaped optical fiber sensor for the refractive index monitoring of liquid

2015 ◽  
Vol 63 (8) ◽  
pp. 750-755 ◽  
Author(s):  
Hummad Habib Qazi ◽  
Abu Bakar bin Mohammad ◽  
Harith Ahmad ◽  
Mohd Zamani Zulkifli ◽  
Sulaiman Wadi Harun
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Single Mode ◽  
Fiber Sensor

scholarly journals An Optical Fiber Sensor for Oriented Bending Based on Eccentric UV Exposure

2020 ◽  
Vol 38 (6) ◽  
pp. 1235-1239
Author(s):  
Dakuan Yu ◽  
Xueguang Qiao ◽  
Xiangyu Wang ◽  
Lisong Zhang
Keyword(s):  
Optical Fiber ◽  
Optical Sensor ◽  
Oil And Gas ◽  
Optical Fiber Sensor ◽  
Uv Exposure ◽  
Fiber Sensor ◽  
Fiber Structure ◽  
Oil And Gas Exploration ◽  
Bending Loss ◽  
Cladding Mode

The optical fiber sensor for oriented bending based on eccentric UV exposure is fabricated. With the eccentric UV exposure on the ready-made Michelson interference fiber structure, the optical sensor gives the oriented bending characteristics by changing the radial circular symmetry of fiber cladding refractive indexes. The principle of the asymmetric process of the eccentric exposure to cladding mode are analyzed. The bending loss of the excited cladding mode in different radial directions is detected. The experimental results show that the Michelson interference has some oriented bending characteristics in the eccentric UV exposure process. There are different bending sensitivity in different radial directions. Furthermore, the bending sensitivity is higher on the exposed side and the curvature sensitivity is 5.5 dB·m. On the opposite side, the bending sensitivity is lower and the curvature sensitivity is -1.31 dB·m. With these oriented bending characteristics, the optical sensor can be applied to oil and gas exploration and development and to oriented seismic wave vector detection.

scholarly journals P1.3.9 Detection of Organic Vapors by a Polished Single Mode Optical Fiber Sensor

2012 ◽  
Author(s):  
C. Elosua ◽  
C. Bariain ◽  
I. R. Matias ◽  
A. Luquin ◽  
M. Laguna
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Single Mode ◽  
Fiber Sensor ◽  
Organic Vapors ◽  
Single Mode Optical Fiber

scholarly journals Displacement Sensing of an Active String Actuator by an Optical Fiber

2021 ◽  
Vol 10 (1) ◽  
pp. 35
Author(s):  
Weihang Tian ◽  
Shuichi Wakimoto ◽  
Kazuya Nagaoka ◽  
Yorifumi Yoshimoto ◽  
Takefumi Kanda ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Radius Of Curvature ◽  
Artificial Muscles ◽  
Rigid Displacement ◽  
Displacement Estimation ◽  
Displacement Sensors ◽  
Bending Loss ◽  
Displacement Force

We have fabricated a string-shaped actuator called “Active string” that has high contractile displacement/force by accumulating thin pneumatic artificial muscles using the string production process. However, displacement control of the active string is challenging because general bulky and rigid displacement sensors are not suitable for the sensor element of the active string. Therefore, in this report, a flexible optical fiber sensor is combined with the active string to enable sensing of its displacement. As the active string contracts, the radius of curvature of the optical fiber decreases, and light intensity propagating in the optical fiber decreases due to bending loss. The experimental results showed that the optical fiber sensor value changed with corresponding to the displacement of the active string. It shows the possibility that it is possible to make a displacement estimation of the displacement of the active string using an optical fiber sensor.

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