Fiber-optic dual-technique sensor for simultaneous measurement of strain and temperature

Vengsarkar, Ashish M.; Michie, Craig; Jankovic, Lilja; Culshaw, Brian; Claus, Richard O.

doi:10.1109/50.265750

Cited by 102 publications

(43 citation statements)

References 7 publications

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“…The applications of these fibers include interferometric modal/polarimetric sensors that can be used to measure strain, temperature or both at the same time [2,[8][9][10]. The performances of the interferometric systems are affected by two important parameters, i.e., the group delay difference (GDD) and the phase delay difference (PDD) between the two spatial modes or between the two orthogonal polarizations of the same spatial mode.…”

Section: Introductionmentioning

confidence: 99%

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Properties of elliptical-core two-mode fiber

Wang¹,

Ju²,

Jin³

2005

Opt. Express

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Polarization and modal birefringence of elliptical-core two-mode fibers are investigated. Wavelengths corresponding to zero group delay difference (GDD) between the two spatial modes and between the orthogonal polarizations are computed when the fiber parameters, i.e., the relative core/cladding index difference and the ratio of major over minor axis, are varied. Simple relationships between the zero GDD wavelengths and fiber parameters are obtained. With proper fiber design, zero GDD between the two spatial modes and the two orthogonal polarizations can be achieved at the same wavelength. Lightwave Technol. LT-5, 1041LT-5, -1044LT-5, (1987. 16. Masashi Eguchi, Masanori Koshiba, "Accurate finite-element analysis of dual-mode highly elliptical-core fibers," J. Lightwave Technol. 12, 607-613 (1994). 17. Robert L. Gallawa, I. C. Goyal, Yinggang Tu, and Ajoy K. Ghatak , "Optical waveguide modes: an approximate solution using Galerkin's method with Hermite-Gauss basis functions," IEEE J. Quan. Electron. 21, 518-522 (1991). 18. Tzong-Lin Wu, and Hung-chun Chang, "An efficient numerical approach for determining the dispersion characteristics of dual-mode elliptical-core optical fibers," J. Lightwave Technol. 13, 1926Technol. 13, -1934Technol. 13, (1995 194-197 (1993). 21. C.D. Poole, J.M. Wiesenfeld, D.J. Digiovanni, and A.M. Vengsarkar, "Optical fiber-based dispersion compensation using higher order modes near cutoff," J. Lightwave Technol. 12, 1746-1758 (1994). 22. Wang Zhi, Ren Guobin, Lou Shuqin, Liang Weijun, "Investigation of the supercell based orthonormal basis function method for different kinds of fibers," Opt.

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Section: Introductionmentioning

confidence: 99%

“…Two-mode optical fibers have been studied for a number of devices and sensors applications [1][2][3][4][5][6][7][8][9][10][11][12][13]. Two-mode operation can be achieved by operating a conventional circular-core fiber below cut-off and hence it supports the fundamental LP 01 and the second order hybrid LP 11 modes.…”

Section: Introductionmentioning

confidence: 99%

Properties of elliptical-core two-mode fiber

Wang¹,

Ju²,

Jin³

2005

Opt. Express

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“…The condition number therefore only provides a qualitative analysis [23]. The condition number is calculated based on maximum errors in a measurement system [24] and for this reason the results of Table 1(b) shows some agreement between this number and the maximum/cumulative errors. The errors of ±1 o C and ±11  obtained from the TFBG sensor reported in this paper are comparable to errors of ±1 o C and ±12  calculated for a 2 co-located FBG sensor system [3] (2 different wavelengths).…”

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confidence: 92%

Temperature and strain discrimination using a single tilted fibre Bragg grating

Chehura

James

Tatam

2007

Optics Communications

119

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A fibre optic sensor capable of discriminating between temperature and strain, using a single fibre Bragg grating, is presented. The technique exploits the core-cladding mode coupling of a tilted fibre Bragg grating (TFBG). The core and cladding modes exhibit different thermal sensivities, while the strain sensivities are approximately equal. Monitoring the core-core mode coupling resonance and the core-cladding mode coupling resonance of the TFBG spectrum allows the separation of the temperature and strain induced wavelength shifts.

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“…As compared with the traditional two-fiber interferometers [6], the in-fiber devices based on a single fiber has the advantage of compactness, common mode noise reduction, and easiness for embedding into materials for smart structure applications [7]. Early works used dual mode elliptical fibers and the interference between the two lowest order LP modes or between different polarizations of the two modes were exploited for simultaneous strain and temperature measurement [1,[3][4][5]. The mode coupling/splitting for these interferometers was realized by off-set alignments or the use of mode splitters [2]; however, fabrication of the in-fiber devices realizing mode splitting/polarizing is not straightforward and need complex polishing, alignment and/or metal coating procedures [8].…”

Section: Introductionmentioning

confidence: 99%

“…In-fiber interferometers based on the interference of different modes/polarizations have been a subject of continuous interest due to their potential applications as multi-wavelength combfilters and sensors for multi-parameter measurement [1][2][3][4][5]. As compared with the traditional two-fiber interferometers [6], the in-fiber devices based on a single fiber has the advantage of compactness, common mode noise reduction, and easiness for embedding into materials for smart structure applications [7].…”

Section: Introductionmentioning

confidence: 99%

In-fiber polarimeters based on hollow-core photonic bandgap fibers

Xuan¹,

Jin²,

Zhang³

et al. 2009

Opt. Express

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In-fiber polarimeters or polarization mode interferometers (PMIs) are fabricated by cascading two CO2-laser-induced in-fiber polarizers along a piece of hollow-core photonic bandgap fiber. Since the two interfering beams are the orthogonal polarizations of the fundamental mode, which are tightly confined to the core and have much lower loss than higher order modes, the PMIs can have either short (e.g., a few millimeters) or long (tens of meters or longer) device length without significantly changing the fringe contrast and hence provide design flexibility for applications required different device lengths. As examples of potential applications, the PMIs have been experimentally demonstrated for wavelength-dependent group birefringence measurement; and for strain, temperature and torsion sensors. The PMI sensors are quite sensitive to strain but relatively insensitive to temperature as compared with fiber Bragg grating sensors. The PMIs function as good directional torsion sensors that can determine the rate and direction of twist at the same time.

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Fiber-optic dual-technique sensor for simultaneous measurement of strain and temperature

Cited by 102 publications

References 7 publications

Properties of elliptical-core two-mode fiber

Properties of elliptical-core two-mode fiber

Temperature and strain discrimination using a single tilted fibre Bragg grating

In-fiber polarimeters based on hollow-core photonic bandgap fibers

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