Results 71 to 80 of about 972 (166)

Bridge Strain Monitoring Using Distributed Fiber Optics: Application and Validation under Traffic Loading

e-Journal of Nondestructive Testing
This study investigates the use of distributed fiber optic sensing (DFOS) with Optical Frequency Domain Reflectometry (OFDR) to monitor strain in reinforced concrete bridges under typical traffic loading.
Rodrigo Tapia Corvalan, You-Jia Li, Han Liu, Matthew M. DeJong   +3 more
doaj   +1 more source

High-Spatial-Resolution High-Accuracy OFDR Distributed Sensors Based on Seamless fs-WFBG Array

Photonics
In optical frequency domain reflectometry (OFDR), the random optical noise in Rayleigh backscattering and the sliding window length in the algorithm cause a trade-off between sensing spatial resolution and accuracy.
Zhengze Jin, Wenzhu Huang, Yuanjing Zhao, Wentao Zhang   +3 more
doaj   +1 more source

OFDR for optical fiber detectors

, 2016
The present PhD thesis have been carried out at the Laboratoire de Mesures Optiques (Optical Measurement Laboratory) based at CEA Saclay Nuclear Research Center, France. It concerns theoretical analysis and experimental realizations of a “distributed Optical Fiber Sensor” based on Optical Frequency Domain Reflectometry using the Rayleigh backscattering
openaire   +1 more source

Distributed Fiber Optic Sensor for Accurate Liquid Level Monitoring Based on Optical Frequency Domain Reflectometry

Advanced Devices & Instrumentation
This study presents a highly accurate liquid level monitoring system utilizing optical frequency domain reflectometry (OFDR). The proposed system detects environmental characteristics along the length of the optical fiber and determines liquid levels in ...
Ying Mei, Xuefeng Wang, Yong Yang, Xiaojun Yang, Xuechao Tian, Rui Du   +5 more
doaj   +1 more source

An ERPNS Technology Based on OFDR for Accurate Arm-Length Difference Measurement of Optical Fiber Interferometer Under Dynamic Environment

IEEE Photonics Journal
Accurate measurement of interferometer arm-length difference is very important in the application fields such as fiber optic hydrophones. However, the interferometer is very sensitive to the environmental vibration and noise, which affects the accuracy ...
Luwei Shuai, Lei Ye, Qing Ye
doaj   +1 more source

Design Concept of Fiber Optic Bending Sensor using Incohrent Optical Frequency Domain Reflectometry and Two Photon Absorption Process in Avalanche Photodiode

International Journal of Technology
In various fields, bending sensors based on optical fibers have gained significant attention. These include structural health monitoring and shape measurement of medical devices such as catheters.
Yuta Kurihara, Shinta Tsuzuki, Takuma Serizawa, Yosuke Tanaka   +3 more
doaj   +1 more source

Vibration measurement technique by using OFDR with in-line interferometers

e-Journal of Nondestructive Testing
Due to their compact size, electromagnetic interference immunity, and compatibility with embedding in composite materials, optical fiber sensors have emerged as a versatile and integral solution for structural health monitoring (SHM) in various structures. Among the key contributors to the evolution of this field is the significant progress in optical
Muyu Shi, Daniel Leandro, Mengshi Zhu, Hideaki Murayama   +3 more
openaire   +1 more source

Theoretical Analysis of Vernier-Effect-Induced Sensitivity Enhancement of Dual Fiber Fabry-Pérot Cavities in OFDRs

Photonics
The vernier-effect-based sensitivity enhancement of two kinds of sensing units consisting of dual fiber Fabry-Pérot (FP) cavities in the Optical Frequency Domain Reflectometry (OFDR) is analyzed in this paper.
Mingxin Wang, Yueyu Xiao
doaj   +1 more source

OFDR optic fiber measurements: Performance limitations

As a part of the PhD research project, an OFDR Rayleigh-based optic fiber sensor is embedded as shown in a beam sample, passing through it 4 times to provide strain measurements along the axis of the fiber during a quasi-static 4-point bending test. Throughout the test, strain data in certain zones-generally where higher strains occur-disappeared and ...
Farahbakhsh, Sahar, Poncelet, Martin, Chamoin, Ludovic   +2 more
openaire   +1 more source

A Review of Multiparameter Fiber-Optic Distributed Sensing Techniques for Simultaneous Measurement of Temperature, Strain, and Environmental Effects. [PDF]

Sensors (Basel)
Turov A, Fotiadi A, Korobko D, Panyaev I, Belokrylov M, Barkov F, Konstantinov Y, Kambur D, Sakhabutdinov A, Qaid M.   +9 more
europepmc   +1 more source