Temperature- and strain-independent torsion sensor using a fiber loop mirror based on suspended twin-core fiber

Frazão, Orlando; Silva, Ricardo M.; Kobelke, Jens; Schuster, Kay

doi:10.1364/ol.35.002777

Cited by 78 publications

(40 citation statements)

References 21 publications

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“…From these results, it could be noticed that the fringe amplitude presents very low dependence on the temperature. This behavior was similar to the one reported in the literature [16]. The lack of temperature sensitivity is an important feature for the application of this configuration as a torsion sensor.…”

Section: Introductionsupporting

confidence: 89%

Temperature-independent torsion sensor based on “figure-of-eight” fiber loop mirror

2012

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An interrogation sensor system combining the "figure-of-eight" fiber loop mirror using a single directional 3×3 fiber optic coupler was proposed. One fiber loop mirror was formed by inserting a length of high birefringent optical fiber at the input ports of the 3×3 coupler. Splicing the output ports of the 3×3 coupler between them created the other fiber loop mirror. The introduction of this second loop gave rise to two polarization states of light with the same frequency but different optical phase. The mechanical torsion sensing head was located at the second loop and was exhibited an average modulus torsion sensitivity of 7.9×10 -4 degree/dB. The performance of the sensor was not affected by environmental temperature variations.

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Section: Introductionsupporting

confidence: 89%

Temperature-independent torsion sensor based on “figure-of-eight” fiber loop mirror

2012

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“…Many fiber-optic torsion sensors have been proposed, including interferometers formed with special fibers (such as hollow-core photonic bandgap fibers [1] , highly birefringent photonic crystal fibers [2,3] , and twin-core fibers [4] ) and a range of wavelength-encoded grating sensors [5][6][7][8][9][10] . However, many of these sensors cannot tell the sense (clockwise or counterclockwise) of the applied torsion [1][2][3][4][5][6] . Torsion sensors that employ specially made long-period fiber gratings (LPFGs) can tell the sense of the applied torsion, but the broadband nature of the LPFG limits the resolution of the measurement [7][8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Fiber ring laser incorporating a pair of rotary long-period fiber gratings for torsion measurement

et al. 2012

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We demonstrate a fiber ring laser for high-resolution torsion measurement, where the laser cavity consists of a Mach-Zehnder interferometer (MZI) formed with a pair of long-period fiber gratings written in a twisted single-mode fiber (SMF) by a CO 2 laser. The emitting wavelength of the laser provides a measure of the rate of the torsion applied to the grating pair, while the direction of the wavelength shift indicates the sense direction of the applied torsion. The narrow linewidth and the large side-mode suppression ratio of the laser can provide a much more precise measurement of torsion, compared with passive fiber-optic torsion sensors. The torsion sensitivity achieved is 0.084 nm/(rad/m) in the torsion range ±100 rad/m, which corresponds to a torsion resolution of 0.12 rad/m, assuming a wavelength resolution of 10 pm for a typical optical spectrum analyzer.

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“…More recently, another type of microstructured dual-core fiber was developed: the suspended twin-core fiber. In this case the two cores appear to be suspended in large air holes by thin glass bridges [8]. All these configurations can be used for the measurement of different parameters, such as refractive index [5,9,10] or biosensing [6].…”

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confidence: 99%

High-sensitivity dispersive Mach–Zehnder interferometer based on a dissimilar-doping dual-core fiber for sensing applications

et al. 2014

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A dual-core fiber in which one of the cores is doped with germanium and the other with phosphorus is used as an in-line Mach-Zehnder dispersive interferometer. By ensuring an equal length but with different dispersion dependencies in the interferometer arms (the two cores), high-sensitivity strain and temperature sensing are achieved. Opposite sensitivities for high and low wavelength peaks were also demonstrated when strain and temperature was applied. To our knowledge this is the first time that such behavior is demonstrated using this type of in-line interferometer based on a dual-core fiber. A sensitivity of 0.102 0.002 nm∕με, between 0 and 800 με and −4.2 0.2 nm∕°C between 47°C and 62°C is demonstrated.

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Temperature- and strain-independent torsion sensor using a fiber loop mirror based on suspended twin-core fiber

Cited by 78 publications

References 21 publications

Temperature-independent torsion sensor based on “figure-of-eight” fiber loop mirror

Temperature-independent torsion sensor based on “figure-of-eight” fiber loop mirror

Fiber ring laser incorporating a pair of rotary long-period fiber gratings for torsion measurement

High-sensitivity dispersive Mach–Zehnder interferometer based on a dissimilar-doping dual-core fiber for sensing applications

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