Coherent Fiber-Optic Sensor for Ultra-Acoustic Crack Emissions

A coherent optical fiber sensor with adequate sensitivity for detecting the acoustic emission (AE) during the propagation of a crack in a ferrous material is presented. The proposed fiber optic sensor is successfully compared in terms of the SNR (Signal to Noise Ratio) and detectable AE energy levels to commercially available AE piezo-transducers sensors and is proven to be an effective and advantageous alternative for sensing and monitoring fatigue damage in structural applications.

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An Optical Fiber Sensor for Measuring Light Absorption in Suspension Solutions

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.121-126.2509 ◽

2011 ◽

Vol 121-126 ◽

pp. 2509-2513

Author(s):

Fei Bing Xiong ◽

N Djeu ◽

Wen Zhang Zhu

Keyword(s):

Optical Fiber ◽

Glassy Carbon ◽

Fiber Optic ◽

Optical Fiber Sensor ◽

Fiber Optic Sensor ◽

Fiber Sensor ◽

Graphite Flake ◽

Chemical Information ◽

Carbon Particles ◽

Optic Sensor

An optical fiber sensor based on attenuated total reflectance (ATR) for extraction chemical information from highly scattering turbid materials has been evaluated. The influence of particles on bulk absorption and ATR transmitted spectra of micron-sized graphite flakes and spherical glassy carbon suspensions were investigated. The ATR transmitted spectra of coiled fiber-optic sensor in those suspensions with various concentrations are insensitive to scattering of suspended particles, especially for graphite flake suspensions. The reason for different influence of graphite flakes and spherical glassy carbon particles suspensions on e ATR spectra analyzed. This study demonstrates that fiber-optic sensor based on ATR technique is a feasible technique in application for monitoring turbid suspensions.

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Performance parameters evaluation of surface plasmon resonance based fiber optic sensor with different bilayer metals: Theoretical study.

Al-Mustansiriyah Journal of Science ◽

10.23851/mjs.v29i1.248 ◽

2018 ◽

Vol 29 (1) ◽

pp. 195 ◽

Cited By ~ 1

Author(s):

Murtadha Faaiz Sultan ◽

Ali A. Al-Zuky ◽

Shehab A. Kadhim

Keyword(s):

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Figure Of Merit ◽

Fiber Optic ◽

Signal To Noise Ratio ◽

Fiber Optic Sensor ◽

Performance Parameters ◽

Signal To Noise ◽

Optic Sensor

Surface plasmon resonance (SPR) based fiber optic sensor with three types of bilayer configurations (silver/gold, copper/gold, and aluminum/gold) is theoretically analyzed. Performance parameters like sensitivity, signal to noise ratio, figure of merit, and resolution are evaluated for each configuration. Signal to noise ratio (SNR), and figure of merit (FOM) are enhanced very well for the selected bilayer configurations as the outer gold layer thickness increased, the sensitivity enhanced also but with small frictions while the resolution has decreased slightly.

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LabVIEW Applications for Fiber-Optic Remote Test and Fiber Sensor Systems

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.610.216 ◽

2014 ◽

Vol 610 ◽

pp. 216-220

Author(s):

Liang Yu Su

Keyword(s):

Time Domain ◽

Fiber Optic ◽

Fiber Optic Sensor ◽

Fiber Sensor ◽

Optic System ◽

Optical Time Domain Reflectometer ◽

Optic Sensor ◽

Optical Time ◽

Fiber Optic System ◽

Time Domain Reflectometer

This paper demonstrates applications of LabVIEW in automatic test measurement of fiber optic system.First,the LabVIEW applications in fiber optic system and the basics of instrument connectivity are presented.Then,the aspects of hardware communication to external instruments through GPIB and serial interfaces are analyzed.Next,self-calibrating automated characterization system for depressed cladding applications is demonstrated utilizing the LabVIEW’s GPIB interface. Results of the manual and automatic measurements and the analysis of the measurement trace obtained from the optical time domain reflectometer (OTDR) are shown.In the end,two applications of LabVIEW in fiber optic sensor system are discussed.

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Fiber-Optic Sensor Technology and Combinatorial Chemistry

MRS Proceedings ◽

10.1557/proc-804-jj7.7 ◽

2003 ◽

Vol 804 ◽

Author(s):

Peter Geissinger ◽

Barry J. Prince ◽

Nadejda T. Kaltcheva ◽

Maureen J. Prince ◽

Alan W. Schwabacher

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Combinatorial Chemistry ◽

Fiber Optic ◽

Optical Fiber Sensor ◽

Combinatorial Libraries ◽

Fiber Optic Sensor ◽

Fiber Sensor ◽

Sensor Technology ◽

Compound Libraries

ABSTRACTOur recently introduced “Fiber-Optic Combinatorial Chemistry” technique combines combinatorial synthetic methods and optical fiber sensor technologies. Our one-dimensional combinatorial chemistry method allows for synthesis of large compound libraries in a linear format, for example in the cladding of optical fibers. Subjecting these libraries to assays that indicate positive identification of a library member by the binding of a fluorescent group, produces, in effect, an optical fiber sensor array. The location of a particular fluorescent region along the optical fiber can be determined through the optical time-of-flight technique, in which laser pulses propagating through the fiber core probe through their evanescent fields the fluorescent properties of the compounds located in the fiber cladding. It is a virtue of our combinatorial synthetic procedure that with the location of a compound on the fiber, its synthetic history is immediately known. We demonstrated that limitations on the spatial resolution of compounds along the fiber due to the excited state lifetimes of the fluorescent marker molecules can be overcome by the use of a second fiber - evanescently coupled to the first one - as an optical delay.The existing claddings of optical fibers severely restrict the range of chemistries for the synthesis of combinatorial libraries. Therefore, in order to make our method more generally applicable, the existing fiber cladding has to be replaced by a porous material that can act as solid support for reactions and at the same time preserve the optical guiding conditions of the fiber. In this contribution we discuss the requirements for such a replacement cladding and evaluate the general suitability of a functionalized candidate material.

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