scholarly journals Distributed Fiberoptic Sensor for Simultaneous Temperature and Strain Monitoring Based on Brillouin Scattering Effect in Polyimide-Coated Fibers

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Liwen Sheng ◽  
Ligong Li ◽  
Leijun Hu ◽  
Ming Yuan ◽  
Jinpeng Lang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Brillouin Scattering ◽  
Optical Fiber Sensor ◽  
Frequency Shifts ◽  
Strain Monitoring ◽  
Excellent Candidate ◽  
Sensitivity Problem ◽  
Distributed Measurement ◽  
Two Peaks ◽  
Fiberoptic Sensor

A unique multiparameter sensor for distributed measurement of temperature and strain based on spontaneous Brillouin scattering in polyimide-coated optical fiber is proposed, which is an excellent candidate for the cross-sensitivity problem in conventional Brillouin sensing network. In the experimental section, the discrimination of strain and temperature is successfully demonstrated by analysing the unequal sensing coefficients of the Brillouin frequency shifts generated by different acoustic modes. The Brillouin frequency shifts of the main two peaks are successfully measured to discriminate the strain and temperature with an accuracy 19.68 με and 1.02°C in 2.5 km sensing range. The proposed distributed Brillouin optical fiber sensor allows simultaneous measurement of temperature and strain, thus opening a door for practical application such as oil explorations.

A Multiplexed Optical Fiber Sensor System For Distributed Measurement Of Structural Strains

1997 ◽  
Vol 503 ◽  
Author(s):  
F. Ansari ◽  
Z. Chen ◽  
Q. Li
Keyword(s):  
Optical Fiber ◽  
Optical Switch ◽  
Optical Fiber Sensor ◽  
Fiber Material ◽  
Smart Structure ◽  
Sensor System ◽  
Fiber Sensor ◽  
Fiber Sensors ◽  
Large Structures ◽  
Distributed Measurement

ABSTRACTStructurally integrated optical fiber sensors form the basis for smart structure technology. Over the past decade a variety of sensor configurations have been developed for measurement of strains and deformations in structures. Strains and deformations alter the refractive index and the geometry of the optical fiber material. These changes perturb the intensity, phase, and polarization of the light-wave propagating along the probing fiber. The optical perturbations are detected for the determination of strain. The research presented here describes the development of a new optical fiber sensor system for measurement of structural strains based on white light interferometry. An optical switch provides for multiplexing of strain signals from various locations in the structure. Redundant Bragg grating type fiber optic sensors as well as strain gauges were employed for comparison and verification of strain signals as measured by the new system. The system provides capability for distributed sensing of strains in large structures.

Novel Measurement System With Optical Fiber Sensor for Strain Distributions in Welded Tubular Joints

2008 ◽  
Author(s):  
Hideaki Murayama ◽  
Kazuro Kageyama ◽  
Kohei Ohara ◽  
Kiyoshi Uzawa ◽  
Makoto Kanai ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Spatial Resolution ◽  
Measurement System ◽  
Strain Distribution ◽  
Welded Joint ◽  
Optical Fiber Sensor ◽  
Weld Line ◽  
Fiber Sensor ◽  
Strain Monitoring ◽  
Tubular Joint

Defects and damage in a structural joint can trigger a critical degradation or collapse of the structure. Among joints, welded joints have many uncertainties, such as remaining stress, initial defects, and heat-affected zone. Such uncertainties in a welded joint can also induce a strain fluctuation, when they are subjected to a load. Conversely, the strain fluctuation along the weld line may represent the presence of uncertainties in the welded joint. This means that monitoring strain distribution along the weld line can be good way to assess their integrity and improve reliability of the structure. We have developed a novel distributed strain measurement technique which can measure strain distributions along fiber Bragg gratings (FBG) in an optical fiber and has the high spatial resolution and we applied it to strain monitoring of a welded tubular joint. The spatial resolution o is less than 1 mm and it was confirmed by measurement simulations and experiments. Then, we measured the strain distributions along the weld line of the tubular joint of a steel pipe subjected to a tensile load by the developed measurement system. We could successfully measure the development of the strain distribution along the weld line, where the sharply fluctuating strain distributions resulting from some defects were observed. In this paper, we describe the measurement principle and performance of the optical fiber sensor, and then show the results of strain monitoring in the welded joint.

scholarly journals Distributed measurement of high electric current by means of polarimetric optical fiber sensor

2015 ◽  
Vol 23 (9) ◽  
pp. 11073 ◽  
Author(s):  
Luca Palmieri ◽  
Davide Sarchi ◽  
Andrea Galtarossa
Keyword(s):  
Optical Fiber ◽  
Electric Current ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Distributed Measurement

scholarly journals Distributed Optical Fiber Sensor Applications in Geotechnical Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7514
Author(s):  
Aldo Minardo ◽  
Luigi Zeni ◽  
Agnese Coscetta ◽  
Ester Catalano ◽  
Giovanni Zeni ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Brillouin Scattering ◽  
Optical Fiber Sensor ◽  
Early Warning Systems ◽  
Optical Fiber Sensors ◽  
Small Scale ◽  
Sudden Increase ◽  
Fiber Sensors ◽  
Artificial Rainfall ◽  
Distributed Optical Fiber

We report the experimental application of distributed optical fiber sensors, based on stimulated Brillouin scattering (SBS), to the monitoring of a small-scale granular slope reconstituted in an instrumented flume and subjected to artificial rainfall until failure, and to the monitoring of a volcanic rock slope. The experiments demonstrate the sensors’ ability to reveal the sudden increase in soil strain that foreruns the failure in a debris flow phenomenon, as well as to monitor the fractures in the tuff rocks. This study offers an important perspective on the use of distributed optical fiber sensors in the setting up of early warning systems for landslides in both rock and unconsolidated materials.

Design of Flat Optical Fiber Sensor for Triaxial Strain Monitoring in Composite Laminates

2021 ◽  
Author(s):  
Andrea Annunziato ◽  
Francesco Anelli ◽  
Michael Godfrey ◽  
Janice M Barton ◽  
Christopher Holmes ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Composite Laminates ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Strain Monitoring

scholarly journals Distributed Measurement of Temperature for PCC Energy Pile Using BOFDA

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Lei Gao ◽  
Baoquan Ji ◽  
Gangqiang Kong ◽  
Xu Huang ◽  
Mingkun Li ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Optical Fiber ◽  
Temperature Variation ◽  
Urban Areas ◽  
New Technology ◽  
Optical Fiber Sensor ◽  
Frequency Domain Analysis ◽  
Energy Pile ◽  
Circulating Water ◽  
Distributed Measurement

PCC energy pile is a new technology for sustainable development of urban areas. Learning and understanding the temperature variation of PCC energy pile are very important to its development and application. In this study, the Brillouin optical frequency domain analysis (BOFDA) technology is firstly used to measure the temperature variation of PCC energy pile from a model test. The aim is to provide an optical fiber sensing method for monitoring the temperature distribution of PCC energy pile. When the temperatures of circulating water are 70°C, 60°C, 50°C, and 40°C, the result shows that the temperatures of PCC energy pile under different conditions are measured well by the optical fiber sensor. It will help to master the temperature distribution and thermomechanical characteristic of PCC energy pile. It can also provide the important scientific and theoretical basis for the design and application of PCC energy pile.

scholarly journals Review of Optical Fiber Sensor Network Technology Based on White Light Interferometry

2021 ◽  
Vol 11 (1) ◽  
pp. 31-44
Author(s):  
Wenchao Li ◽  
Yonggui Yuan ◽  
Jun Yang ◽  
Libo Yuan
Keyword(s):  
Optical Fiber ◽  
Sensor Network ◽  
White Light ◽  
Large Scale ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Long Distance ◽  
Light Interference ◽  
White Light Interference ◽  
Distributed Measurement

AbstractOptical fiber sensor networks (OFSNs) provide powerful tools for large-scale buildings or long-distance sensing, and they can realize distributed or quasi-distributed measurement of temperature, strain, and other physical quantities. This article provides some optical fiber sensor network technologies based on the white light interference technology. We discuss the key issues in the fiber white light interference network, including the topology structure of white light interferometric fiber sensor network, the node connection components, and evaluation of the maximum number of sensors in the network. A final comment about further development prospects of fiber sensor network is presented.

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