Effect of the plastic coating on strain measurement of concrete by fiber optic sensor

Li, Qingbin; Li, Guang; Guanglun, Wang

doi:10.1016/s0263-2241(03)00052-6

Cited by 33 publications

(17 citation statements)

References 8 publications

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“…It was found that the compression deformation of three cables shows the tendency of PSC [ FPC [ MRC at both stage I The difference between the deformations measured by different optical fibers is due to their different strain transfer coefficients, which is affected by the length of the sensor, the thickness and Young's modulus of the interlayer. It has been reported that the average strain transfer coefficient increases with sensor length, rises with the increase of the interlayer Young's modulus, and decreases with the thickening of the interlayer [32,33]. PSC has the smallest strain loss but it is easier to have a breakpoint due to the lack of sheath protection.…”

Section: Deformation Characteristics Of Main Compression Layersmentioning

confidence: 99%

Application of distributed fiber optic sensing technique in land subsidence monitoring

Jiang

et al. 2015

J Civil Struct Health Monit

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Distributed fiber optic sensing (DFOS), a newly developed structure health monitoring technique, has been proved to be a very suitable and useful technique for the monitoring and the early warning of structural engineering. Its application in geotechnical engineering, especially land subsidence resulted by groundwater withdraw, was limited by the complex characteristics of geotechnical materials in the field. In this paper, Brillouin optical time domain reflectometer (BOTDR) and fiber Bragg grating (FBG) techniques were used to monitor the deformation of soil layers and pore water pressure for nearly 2 years in a 200-m borehole with four different types of optical fibers planted directly in the borehole. The result demonstrated that cables with better sheath protection and higher tension strength are more suitable for field monitoring. The main compaction occurs at two thick aquitards which are adjacent to the pumping confined aquifer. The deformation of soil layers shows the conformance with the change of groundwater level over time and the deformation of sand layer had instantaneity while that of clay layer had hysteresis. Rebound amount caused by the rise of ground water level was small, and the re-compression rate significantly decreases after rebounding. This paper demonstrates that the DFOS technique is a very advanced monitoring method for the investigation on the mechanism of land subsidence and the evaluation of soil compression deformation potential.

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Section: Deformation Characteristics Of Main Compression Layersmentioning

confidence: 99%

Application of distributed fiber optic sensing technique in land subsidence monitoring

Jiang

et al. 2015

J Civil Struct Health Monit

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“…Knowledge of the strain transfer mechanisms between fiber and polymer is essential for this transmission. Following the calculations of [8] the axial stress c7z and strain Fz in the fiber is depending on material parameters (Young's modulus E, shear modulus G) and geometrical parameters (radius r of fiber coating, length of fiber L). Score (Z) = Score (oQ1 -sinh (22. z) sl,,, (z) mt (o( I 5 h z)) with F Ecoreriore (ln(rmat / rcoat)I Gmat + ln(rcoat I rcore ) Gcoat)…”

Section: Resultsmentioning

confidence: 99%

Fiber Optic Strain and Structural Health Monitoring in Polymer Electronic Packaging

Schreier-Alt

Ansorge

Reichl

2007

2007 Proceedings 57th Electronic Components and Technology Conference

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Packaging and curing induced stresses are the starting points for all further electronic reliability estimations [1]. Strain measurement in epoxy polymers during molding and curing is presented by use of embedded fiber optic Bragg grating (FBG) sensors. By mechanical coupling between polymer and fiber the FBG sensor enables monitoring of encapsulation induced strains and forces acting on the embedded electrical components. Determination of gel point and material shrinkage is possible directly in the mechanical environment of the product and production line as well as structural health monitoring of the encapsulated electronic components. It is shown that the grating is able to detect delaminations within the polymer during curing and post curing processes. We successfully tested fiber optic strain sensors in industrial transfer molding processes.

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“…The existence of a coating on optical fiber results in difference between the strain of the structure and the strain sensed by surface mounted or embedded FOS. Qingbin et al 28 based on some assumptions derived a theoretical model.…”

Section: Strain Transfer Processmentioning

confidence: 99%

Stability and reliability of fiber optic measurement systems: basic conditions for successful long term structural health monitoring

2011

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Recent developments in fiber optic sensors for monitoring civil structures have been of great help for engineers dealing with these structures. After literature survey it is observed that while using fiber optic sensor system for health monitoring of civil structures not much attention is given to the core quality of the fiber, types of coating on fiber, implementing methodologies, handling of fiber optic sensors and their long term effect on reliability of the performance of the monitoring system. These issues are important because the structural conditions, stress level and environment in which fiber optic sensors are placed are different from telecommunication industry. In this paper issues related to long term structural health monitoring of civil structures are investigated. The issue of the fatigue property of optic fiber is discussed since reversal bending of the fiber may cause adverse effect on the light carrying capacity of the fiber. Other long term structural health monitoring (SHM) issues such as life of fiber, strain transfer process from fiber core to coating, calibration of fiber and selection of fiber are also discussed based on the experiments carried out for successful implementation of long term health monitoring of civil structures. The main objective of these experiments is to come up with comprehensive long term structural health monitoring system for strain measurement.

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Effect of the plastic coating on strain measurement of concrete by fiber optic sensor

Cited by 33 publications

References 8 publications

Application of distributed fiber optic sensing technique in land subsidence monitoring

Application of distributed fiber optic sensing technique in land subsidence monitoring

Fiber Optic Strain and Structural Health Monitoring in Polymer Electronic Packaging

Stability and reliability of fiber optic measurement systems: basic conditions for successful long term structural health monitoring

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