scholarly journals Temperature Measurement Using Optical Fiber Methods: Overview and Evaluation

2020 ◽  
Vol 2020 ◽  
pp. 1-25
Author(s):  
Martin Mikolajek ◽  
Radek Martinek ◽  
Jiri Koziorek ◽  
Stanislav Hejduk ◽  
Jan Vitasek ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Fiber Optic ◽  
Electrical Measurement ◽  
Optical Methods ◽  
Fiber Sensors ◽  
Fiber Properties ◽  
Critical Areas ◽  
Functional Combination ◽  
Intensive Development

The paper deals with the overview of fiber optic methods suitable for temperature measurement and monitoring. The aim is to evaluate the current research of temperature measurements in the interval from temperature close to 0 up to 1000°C. Since the measuring chain is a functional combination of optical methods, optical fiber properties, and other photonic elements together with control electronic circuits, it is necessary to find a suitable compromise between the chosen measurement method, measuring range, accuracy, and resolution. Optical fiber sensors can be used in cases where standard electrical measurement methods cannot be used. These may be areas with high electrical and magnetic interference or critical areas. Therefore, there is intensive development of optical and fiber optic methods based on blackbody and greybody radiation, luminescence, fiber Bragg gratings (FBGs), and interferometers.

Integrated Fiber Optic Sensors For Nondestructive Characterization Of Concrete Structures

1997 ◽  
Vol 503 ◽  
Author(s):  
F. Ansari
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Optical Fiber Sensor ◽  
Fiber Optic Sensors ◽  
Fiber Sensors ◽  
Fully Integrated ◽  
Integrated Optical ◽  
Concrete Elements

ABSTRACTIt is possible to monitor the initiation and progress of various mechanical or environmentally induced perturbations in concrete elements by way of fully integrated optical fiber sensors. Geometric adaptability and ease by which optical fibers can be embedded within concrete elements has led to the development of a number of innovative applications for concrete elements. This article is intended for a brief introduction into the theories, principles, and applications of fiber optic sensors as they pertain to applications in concrete.. However, due to the fact that the transduction mechanism in optical fibers is invariant of the materials employed, the principles introduced here also correspond to other structural materials. The only application related differences among various materials pertain to sensitivity and choice of optical fiber sensor types.

Steel Structure Damage Detection Based on BOTDR Based Distributed Fiber Optic Sensors

2012 ◽  
Vol 424-425 ◽  
pp. 1274-1277 ◽  
Author(s):  
Guo An Wang ◽  
Hao Zhang
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Steel Structure ◽  
Optical Fiber Sensors ◽  
Fiber Optic Sensors ◽  
Time Domain Reflectometry ◽  
Experimental Investigations ◽  
Localized Deformation ◽  
Fiber Sensors ◽  
Structure Damage

For Brillouin Optical Time Domain Reflectometry (BOTDR) based distributed sensing technique, limited by 1m-order spatial resolution, it is difficult to monitor or test localized deformation, and loop installation of optical fiber sensors is a good countermeasure, In this paper, firstly, the measurement behavior and performance of loop installed optical fiber sensors is investigated experimentally, and the accuracy of BOTDR based distributed fiber optic sensors (DFOS) is evaluated. Furthermore, an experimental investigations on a steel specimen is carried out. Based on the investigations, steel structure damage identification method with no requirement for a structural Numerical Model is proposed.

Optical Fiber Loop Sensors for Structural Health Monitoring of Composites

2008 ◽  
Vol 1129 ◽  
Author(s):  
Nguyen Q Nguyen ◽  
Nikhil Gupta
Keyword(s):  
Structural Health Monitoring ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Health Monitoring ◽  
Fiber Optic ◽  
Optical Power ◽  
Single Mode ◽  
Radius Of Curvature ◽  
Fiber Sensors ◽  
Structural Health

AbstractIn the present work a fiber-optic loop-sensor is designed and tested for possible applications in structural health monitoring of composite materials. It is known that bending an optical fiber beyond a critical curvature leads to loss of optical power through the curved region. The optical power loss depends on the radius of curvature of the loop. The optical power can be measured by a photodetector and a change in the power due a change to the curvature can be measured. In the present research optical fiber-optic loop-sensors are developed that can exploit this concept. Single-mode optical fiber sensors having different loop radii, from 6-10 mm, are fabricated and calibrated for applied strain on the loop. The calibration is carried out using a 0.098 N load cell and a computer controlled translation stage having 50 nm step resolution. Results show that the sensors provide highly repeatable curves for loading and unloading cycles. Smaller loop radii lead to higher optical power losses, resulting in higher sensitivity. Calibration results show that such sensors can be used in structural health monitoring applications. In this approach the coating and cladding of optical fibers are maintained intact; therefore, the sensors are robust and can withstand several composites fabrication processes.

scholarly journals Femtosecond Laser Microprinting of a Polymer Optical Fiber Interferometer for High-Sensitivity Temperature Measurement

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1192 ◽  
Author(s):  
Chi Li ◽  
Changrui Liao ◽  
Jia Wang ◽  
Zongsong Gan ◽  
Yiping Wang
Keyword(s):  
Femtosecond Laser ◽  
Optical Fiber ◽  
Temperature Measurement ◽  
Temperature Response ◽  
High Sensitivity ◽  
Optical Fiber Communication ◽  
Polymer Optical Fiber ◽  
Structural Morphology ◽  
Fiber Communication ◽  
Fiber Sensors

Femtosecond laser induced multi-photon polymerization technique can be applied to fabricate an ultracompact polymer optical fiber interferometer which was embedded in a section of hollow core fiber. The production of the photoresin, used in this work, is described. Such a device has been used for temperature measurement, due to its excellent thermal properties. Transmission spectrum, structural morphology, and temperature response of the polymer optical fiber interferometer are experimentally investigated. A high wavelength sensitivity of 6.5 nm/°C is achieved over a temperature range from 25 °C to 30 °C. The proposed polymer optical fiber interferometer exhibits high temperature sensitivity, excellent mechanical strength, and ultra-high integration. More complex fiber-integrated polymer function micro/nano structures produced by this technique may result in more applications in optical fiber communication and optical fiber sensors.

scholarly journals Thin bonding wires temperature measurement using optical fiber sensors

Measurement ◽  
2011 ◽  
Vol 44 (3) ◽  
pp. 554-558 ◽  
Author(s):  
P. Antunes ◽  
A.M. Rocha ◽  
H. Lima ◽  
H. Varum ◽  
P.S. André
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Bonding Wires

scholarly journals Advances in Distributed Fiber-Optic Sensing for Monitoring Marine Infrastructure, Measuring the Deep Ocean, and Quantifying the Risks Posed by Seafloor Hazards

2018 ◽  
Vol 52 (5) ◽  
pp. 58-73 ◽  
Author(s):  
Arthur H. Hartog ◽  
Mohammad Belal ◽  
Michael A. Clare
Keyword(s):  
Optical Fiber ◽  
Marine Environment ◽  
Fiber Optic ◽  
Deep Ocean ◽  
Optical Fiber Sensors ◽  
Sensor Technology ◽  
Fiber Sensors ◽  
Fiber Optic Sensing ◽  
Distributed Optical Fiber

AbstractDistributed optical fiber sensors provide new opportunities for monitoring the marine environment. We review the physical foundations of this sensor technology and discuss how it can be applied to radically augment the networks of subsea sensors that help monitor fundamental marine processes and to complete our understanding of local, regional, and global interactions in this environment.

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