Bend measurement using Bragg gratings in multicore fibre

Gander, M.J.; MacPherson, William N.; McBride, R.; Jones, Julian D. C.; Zhang, L.; Bennion, I.; Blanchard, Pierrette; Burnett, J. G.; Greenaway, A. H.

doi:10.1049/el:20000157

Cited by 170 publications

(77 citation statements)

References 4 publications

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“…Recently we demonstrated one-axis bend measurement by use of FBGs as strain gauges in two cores of a MCF, 9 combining the advantages of FBG strain gauges with the excellent mechanical properties of multicore bend sensors. Recently two-axis curvature measurement was reported: three single-mode f ibers were stacked with FBG strain gauges in a triangular configuration.…”

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confidence: 99%

“…Finally, as the sensor is mounted strain free, the temperature may also be measured simultaneously by use of the absolute wavelength shift, as was demonstrated previously. 9,10 We have successfully demonstrated the use of a multicore optical fiber containing three FBGs for curvature measurement about two axes simultaneously. The sensor measures the magnitude and the plane of curvature.…”

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Two-axis bend measurement with Bragg gratings in multicore optical fiber

et al. 2003

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This version is available at https://strathprints.strath.ac.uk/42768/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. We describe what is to our knowledge the first use of fiber Bragg gratings written into three separate cores of a multicore fiber for two-axis curvature measurement. The gratings act as independent, but isothermal, fiber strain gauges for which local curvature determines the difference in strain between cores, permitting temperature-independent bend measurement.

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Two-axis bend measurement with Bragg gratings in multicore optical fiber

et al. 2003

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“…But in the real world applications such as structure health monitoring (SHM), the bending radii are usually larger than that of the micro-bending therefore the light power loss is not large enough to be detected easily. To solve this problem a dual-grating method based on differential strain measurement was proposed by several groups (Xu et al, 1994a, b, c;Hao et al, 2007;Cai et al, 2007;Gander et al, 2000;Falciai and Trono, 2005;Mondal et al, 2008;Zhang et al, 2005). The basic idea of this method is shown by the schematic shown in Figure 4.…”

Section: B Bendingmentioning

confidence: 99%

“…Considering that these three factors may lead to errors in measurement, it is the smaller the better for the separation d between the two FBGs. An improved method utilizing FBGs in multi-core optical fiber was proposed (Gander et al, 2000). This new method reduces the size of the whole sensor and the opportunity of suffering external interferences.…”

Section: B Bendingmentioning

confidence: 99%

A comparison study of the sensing characteristics of FBG and TFBG

Jiang

2013

Sensor Review

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Purpose -The purpose of this paper is to compare the sensing characteristics of uniform fiber Bragg grating (FBG) and tilted fiber Bragg grating (TFBG) by presenting a detailed research review. Temperature, axial strain, bending, vibration and refractive index measurands of FBG and TFBG sensor are presented and some significant differences are found. Design/methodology/approach -Theoretical analysis and practical application in engineering are investigated and compared from other authors' research papers and self analysis. Spectra behavior of both FBG and TFBG are discussed. Findings -There are found to be significant differences in temperature, axial strain, bending, vibration and refractive index sensing characteristics of FBG and TFBG. Originality/value -The paper's analysis is comprehensive and clear and provides readers with the sensing characteristics of FBG and TFBG in detail.

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“…Local curvature can then be derived from the difference in strain between two strain gauges fixed to opposite sides of the beam; this is the basic type of electrical goniometer [2][3][4]. Fiber optic strain gauges are now well-established [5,6], and bending sensors based on two-mode fiber [7], multi-core fiber photonic crystal fiber [8,9] and multi-core Bragg gratings [10] are also proposed. They can be made by adhering two fiber optic strain sensors to either side of a flexible member [6], or embedding them both in the member.…”

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confidence: 99%

Four-core fiber-based bending sensor

Zhao

Wang

Yuan

2008

Front. Optoelectron. China

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A novel four-core fiber-based bending sensor has been proposed. The four-core fiber is used as the sensing element, the four cores of the fiber act as a four-beam interferometer, and the far-field interferogram grids with periodical distributions are formed on the fiber output end. Since the phase difference is a function of the radius of curvature, the change of the radius of curvature shifts the far-field interferometric grid pattern. A low-coherence laser diode with wavelength of 650 nm is adopted to illuminate the fiber, and the interferogram pattern in the farfield is recorded by a CCD camera. The relationship between the far-field grid pattern intensity distribution and the radius of curvature is established theoretically and confirmed experimentally.

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Bend measurement using Bragg gratings in multicore fibre

Cited by 170 publications

References 4 publications

Two-axis bend measurement with Bragg gratings in multicore optical fiber

Two-axis bend measurement with Bragg gratings in multicore optical fiber

A comparison study of the sensing characteristics of FBG and TFBG

Four-core fiber-based bending sensor

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