scholarly journals Concrete Crack Monitoring Using a Novel Strain Transfer Model for Distributed Fiber Optics Sensors

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2220 ◽  
Author(s):  
Antoine Bassil ◽  
Xavier Chapeleau ◽  
Dominique Leduc ◽  
Odile Abraham
Keyword(s):  
Optical Fiber ◽  
Fiber Optics ◽  
Fiber Optic ◽  
Transfer Model ◽  
Concrete Material ◽  
Fiber Optics Sensors ◽  
Strain Transfer ◽  
Optical Cable ◽  
Concrete Crack ◽  
Crack Monitoring

In this paper, we study the strain transfer mechanism between a host material and an optical fiber. A new analytical model handling imperfect bonding between layers is proposed. A general expression of the crack-induced strain transfer from fractured concrete material to optical fiber is established in the case of a multilayer system. This new strain transfer model is examined through performing wedge splitting tests on concrete specimens instrumented with embedded and surface-mounted fiber optic cables. The experimental results showed the validity of the crack-induced strain expression fitted to the distributed strains measured using an Optical Backscattering Reflectometry (OBR) system. As a result, precise estimations of the crack openings next to the optical cable location were achieved, as well as the monitoring of the optical cable response through following the strain lag parameter.

Imaging Spectroscopy Using Fiber Optics

1997 ◽  
Vol 3 (S2) ◽  
pp. 845-846
Author(s):  
S. Michael Angel ◽  
H. Trey Skinner ◽  
Brian J. Marquardt
Keyword(s):  
Optical Fiber ◽  
Fiber Optics ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Imaging System ◽  
Single Point ◽  
Imaging Spectroscopy ◽  
Small Diameter ◽  
Imaging Spectrometer ◽  
Remote Spectroscopy

Optical fiber probes are routinely used with optical spectrometers to allow measurements to be made on remotely located samples. In most of these systems, however, the optical fibers are used as non-imaging “light pipes” for the transmission of laser light, and luminescence or Raman signals to and from the sample. Thus, while these systems are suitable for remote spectroscopy, they are limited to single-point measurements. In a recent paper, we showed that a small-diameter (i.e., 350 μm) coherent optical fiber bundle can be combined with an AOTF-based imaging spectrometer for fluorescence and Raman spectral micro-imaging with increased flexibility in terms of sample positioning and in-situ capabilities. The previous paper described the operation of the fiber-optic microimaging probe and AOTF imaging system and showed preliminary Raman and fluorescence images for model compounds with 4 μm resolution. We have extended this work to include a discussion of the lateral and vertical spatial resolution of the fiber-optic microprobe in a non-contact proximity-focused configuration.

scholarly journals Electroluminescent optical fiber sensor for detection of a high intensity electric field

2020 ◽  
Vol 12 (1) ◽  
pp. 19
Author(s):  
Tadeusz Piotr Pustelny
Keyword(s):  
Electric Field ◽  
Optical Fiber ◽  
Fiber Optics ◽  
Fiber Optic ◽  
Light Emission ◽  
Fiber Type ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Sensor Technology ◽  
Experimental Investigations

On-line testing of high power electromagnetic devices is one of the most important problems of modern industrial metrology. In the paper, the results of experimental investigations of the electric field optical fiber sensor based on the electroluminescent phenomena are presented. The electro¬luminescent effect is observed in some composite semicon¬ductors, among others in zinc sulfide ZnS crystals. In our investigations, the used ZnS crystal was doped with copper Cu atoms as activators. The concentration of activator in the ZnS crystal was about 5.10-4 [g/g]. According to plans of investi¬gations of the elaborated electroluminescent sensor, the spectral properties as well as the intensity of light emission in sinusoidal alternating electric field were tested.Full Text: PDF References:K.T.V. Grattan, Fiber Optic Fluorescence Thermometry, Chapman and Hall, London, 1996 [CrossRef]K. Kyuma, S. Tai, T. Sawada, "Fiber-optic instrument for temperature measurement", J. Quntum. Electronics, 73(3), 1997 [CrossRef]A. Brief, J. Chem. Educ., 88(6), 731 (2011). [CrossRef]T. Pustelny, B. Pustelny, "Investigation of electroluminophores for their practical application in optical fibre sensor technology", Opto-Electronics Rev.,10(3), 193 (2002). [CrossRef]A.Wrzesinska, Photo- and electroluminophore, Wroclaw, PWN Press, 1988, (in polish) [DirectLink]K.A. Franz, W.G. Kehr, "Luminescent Materials", Ullmans Encyclopedie of Industral Chemistry, Wiley-VCH, Veinhen, 2008 [CrossRef]A.G. Milnes, Deep Impurities In Semiconductors, A Willey-Interscience Publication, Toronto, 1993 [DirectLink]M. Aven, J.S. Prener, Physics and Chemistry of II-VI Compounds, North-Holland Publishing Company - Amsterdam, 1993 [DirectLink]P.K. Cheo, Fiber Optics Devices and Systems, Prentice-Hall, 1985 [CrossRef]D. Randall, Fluorescence and Phosphorescence, Grown, Oxford, 2007. [CrossRef]M. Koen, Photoconductivity of Semiconductors, Edited by Parks, New York, 1996 [CrossRef]K.R. Murphy, C.A. Stedmon, Annal. Methods, 6(3), 658, (2014) [CrossRef]T. Pustelny, K. Barczak, K. Gut, J. Wojcik, "Special optical fiber type D applied in optical sensor of electric currents", Optica Applicata, 34(4), 531 (2004). [DirectLink]K. Barczak, T. Pustelny, D. Dorosz, J. Dorosz, "Polarization maintaining fibers for application in magnetic field measurements", Europ. Phys. Journal: S.T., 154, 11, (2008) [CrossRef]

scholarly journals Analisis Link Budget Penyambungan Serat Optik Menggunakan Optical Time Domain Reflectometer AQ7275

2018 ◽  
Vol 10 (1) ◽  
pp. 36-40
Author(s):  
Tio Hanif Yanuary ◽  
Lita Lidyawati
Keyword(s):  
Optical Fiber ◽  
Fiber Optics ◽  
Time Domain ◽  
High Speed ◽  
Fiber Optic ◽  
Light Wave ◽  
Fiber Optic Cable ◽  
Optical Time Domain Reflectometer ◽  
Optical Time ◽  
Time Domain Reflectometer

An optical fiber is a high-speed telecommunication transmission medium. Principally, an optical fiber is made of a very fine glass fiber material, which is able to transmit light waves using light reflection method on the surface of the fiber optics core. An underground installation of the fiber optics makes this device robust from external interferences. However, the fiber optic cable performance should always be checked to maintain performance during data transmission process. One way to test fiber optics cable performance is by using an Optical Time - Domain Reflectometer (OTDR) device. This device sends a light wave from one point of the fiber optics cable. The light wave then returns when reaching the other point of the fiber optic cable while carrying some measurement parameters especially the physical length and attenuation of a fiber optic cable. The evaluation of the fiber optics cable performance requires the preparation, installation, and configuration of the OTDR. In this paper, we conducted evaluation on the performances of fiber optics cable. The data generated by the performed evaluation indicated an occurring attenuation on the fiber optics cable along 64.402 km of its lengths.

scholarly journals Miniature, All-Silica, Fiber Optics Sensors Produced by Selective Etching of Phosphorus Doped Silica Glass

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1095
Author(s):  
Simon Pevec ◽  
Borut Lenardic ◽  
Denis Donlagic
Keyword(s):  
Optical Fiber ◽  
Fiber Optics ◽  
Optical Fibers ◽  
Silica Glass ◽  
Selective Etching ◽  
Silica Fiber ◽  
Fiber Optics Sensors ◽  
Silica Optical Fiber ◽  
Phosphorus Doped

All-silica optical fiber structures created at the tip, within or along optical fibers can provide unique opportunities for a design of temperature insensitive [...]

Development of Experimental Set for Determination of Refractive Index of Liquid Using Optical Fiber

2016 ◽  
Vol 675-676 ◽  
pp. 722-725
Author(s):  
Tewarit Khanmolee ◽  
Kheamrutai Thamaphat ◽  
Pichet Limsuwan
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Water Temperature ◽  
Fiber Optics ◽  
Output Voltage ◽  
Fiber Optic ◽  
School Class ◽  
High School Class ◽  
Different Temperatures

The construction of an experimental set for measurement of refractive index of liquids using fiber optics has been described in this work. The experimental set is aimed for demonstration in physics high school class. A prototype fabricated in laboratory composes of plastic-clad-plastic (PCP) optical fiber with the length of 50 cm, fiber optic transmitter diode, fiber optic phototransistor detector, and liquid container. The diameter and refractive index of the core of PCP optical fiber were 1 mm and 1.492, respectively. The thickness and refractive index of fiber cladding were 1.2 mm and 1.417, respectively. The fiber cladding surface at the central region was removed approximately 5 cm long to form a sensor area. This sensor area was inserted into a cylindrical glass which acted as the container. One end of the fiber was connected to the transmitter diode with a wavelength of 660 nm, and the other end was connected to the detector. A digital multimeter was used to measure an output voltage from the detector. In this work, the effect of water temperature on its refractive index was determined. The results showed that the water refractive index decreased with increasing water temperature and result in the increase of measured output voltage. Furthermore, it was found that the output voltage measured at different temperatures of water depends linearly on water refractive index.

Detecting the Formation of a Loop in Endoscopic Tubing Using Fiber Optic Techniques

2013 ◽  
Vol 339 ◽  
pp. 462-467
Author(s):  
Ali Harb ◽  
Maria Vanegas ◽  
Daniel Huljev ◽  
Ethan Wong ◽  
Andy S. Zhang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Optics ◽  
Fiber Optic ◽  
Warning Signal ◽  
Endoscopic Procedure ◽  
Doctor Who ◽  
Custom Made

When performing an endoscopic procedure, it is possible that a loop might be formed by the endoscopic tubing inside the patients body. This condition is potentially dangerous and poses a threat to the safety of the patient if the doctor who performs the procedure is unaware of the situation. This paper presents a technique for detecting the formation of an endoscopic loop using fiber optics technology. A custom-made loop detecting device using different configurations of optical fiber wires was developed. The effectiveness of each configuration in detecting the formation of a loop was studied.This loop detecting device was designed such that it can be embedded into an endoscope without increasing the diameter of the endoscopic tubing. If a loop is detected, the device can transmit a warning signal so the doctor who performs the endoscopic procedure can adjust his or her operation to avoid harming the patient.

scholarly journals Evaluation of fiber-optic phase-gradient meta-tips for sensing applications

2019 ◽  
Vol 9 ◽  
pp. 184798041983272 ◽  
Author(s):  
M Principe ◽  
M Consales ◽  
G Castaldi ◽  
V Galdi ◽  
A Cusano
Keyword(s):  
Optical Fiber ◽  
Fiber Optics ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Label Free ◽  
Phase Gradient ◽  
Additional Degree ◽  
Surface Sensitivity ◽  
Light Manipulation ◽  
Sensing Applications

Recently, within the emerging framework of “lab-on-fiber” technologies, we successfully demonstrated the integration of phase-gradient plasmonic metasurfaces on the tip of an optical fiber. The resulting optical-fiber “meta-tips” promise to empower the typical fiber-optics application scenarios (e.g. sensing, telecommunications, imaging, etc.) with the advanced light-manipulation capabilities endowed by metasurfaces. Here, we explore more in detail the possibility to exploit this platform in label-free biological or chemical sensing applications. Specifically, we carry out a parametric study of the surface sensitivity and show that phase-gradient metasurfaces generally outperform their gradient-free counterparts, without imposing additional fabrication complexity. Therefore, the phase gradient can be effectively exploited as an additional degree of freedom in the design of high-sensitivity devices.

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