Torsion-induced effects on UV long-period fiber gratings

González, Daniel A.; Jáuregui, César; Incera, Antonio Quintela; Saavedra, Francisco Javier Madruga; Marquez, P.; López‐Higuera, J. M.

doi:10.1117/12.566619

Cited by 14 publications

(12 citation statements)

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“…To design and manufacture an LPFBG torsion sensor, in principle, any known LPFBG inscription method can be used. These include methods of LPFBG fabrication with ultraviolet (UV)-light [33,34], electric arc induced perturbations [35], mechanical corrugation [36], mechanical load (microbending) [37,38,39,40] and application of CO 2 laser induced perturbation [41,42,43,44,45,46,47,48,49,50,51,52,53]. …”

Section: Sensor Based On Modulation Of Radial Shear Stress Distribmentioning

confidence: 99%

“…LPFBGs fabricated with ultraviolet (UV) irradiation [33,34] experience refractive index modulation of the core and far less of the cladding. This is consequence of Ge doping of the fiber’s core and associated core’s photosensitivity that arises from UV induced and Ge-related color centers.…”

Section: Sensor Based On Modulation Of Radial Shear Stress Distribmentioning

confidence: 99%

“…In comparison to CO 2 inscribed and corrugated LPFBG-based twist/rotation sensors, variations of resonances wavelengths due to the twist are smaller, but the mechanical strength of the fiber is larger, as there are no structural or mechanical changes imposed on the fiber that could reduce its mechanical strength. Typical reported wavelength shift is 0.05 nm/(rad/m) [34]. Another example of a UV-LPFBG twist sensor which utilizes Polarization Dependent Loss (PDL) measurement, was presented in [33].…”

Section: Sensor Based On Modulation Of Radial Shear Stress Distribmentioning

confidence: 99%

“…In this case, a screw-type periodical index-modulation exists along the fiber axis [34,48,61,62]. For common LPFBGs without any applied twist, the phase-matching condition is described with Equation (1).…”

Section: Sensor Based On Modulation Of Radial Shear Stress Distribmentioning

confidence: 99%

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Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review

Budinski

Đonlagić

2017

Sensors

110

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Optical measurement of mechanical parameters is gaining significant commercial interest in different industry sectors. Torsion, twist and rotation are among the very frequently measured mechanical parameters. Recently, twist/torsion/rotation sensors have become a topic of intense fiber-optic sensor research. Various sensing concepts have been reported. Many of those have different properties and performances, and many of them still need to be proven in out-of-the laboratory use. This paper provides an overview of basic approaches and a review of current state-of-the-art in fiber optic sensors for measurements of torsion, twist and/or rotation.

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Section: Sensor Based On Modulation Of Radial Shear Stress Distribmentioning

confidence: 99%

Section: Sensor Based On Modulation Of Radial Shear Stress Distribmentioning

confidence: 99%

Section: Sensor Based On Modulation Of Radial Shear Stress Distribmentioning

confidence: 99%

Section: Sensor Based On Modulation Of Radial Shear Stress Distribmentioning

confidence: 99%

See 2 more Smart Citations

Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review

Budinski

Đonlagić

2017

Sensors

110

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“…Thus the Sagnac loop structure or distributed Bragg reflector (DBR) fiber grating laser has been investigated in detail for the measurement of the twist [7][8][9]. On the other hand, long period fiber gratings (LPFGs) can be fabricated by using CO2 radiation [10], corrugated structures [11], UV radiation [12], or mechanical deformation [13]. Both the elliptical birefringence and the unsymmetrical distribution of the refractive index induced by the twist angle cause a wavelength shift for the transmission dip.…”

Section: Introductionmentioning

confidence: 99%

Phase-shifted helical long-period grating-based temperature-insensitive optical fiber twist sensors

Zhu¹,

Krishnaswamy²,

Jiang

2015

SPIE Proceedings

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In smart structure monitoring, twist angle is one of the most critical mechanical parameters for infrastructure deterioration. A compact temperature-insensitive optical fiber twist sensor based on multi-phase-shifted helical long period fiber grating has been proposed and experimentally demonstrated in this paper. A multi-phase-shifted helical long period fiber grating is fabricated with a multi-period rotation technology. A / 2 π and a 3 / 2 π phase shift is introduced in the helical long period fiber grating by changing the period. The helical pitch can be effectively changed with a different twist rate, which is measured by calculating the wavelength difference between two phase shift peaks. Although the wavelength of the phase shift peak also shifts with a change of the temperature, the wavelength difference between two phase shift peaks is constant due to two fixed phase shifts in the helical long period fiber grating, which is extremely insensitive to temperature change for the multi-phase-shifted helical long period fiber grating. The experimental results show that a sensitivity of up to 1.959 nm/(rad/m) is achieved.

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Torsion‐dependent spectral response of long‐period fiber grating based on electric arc technique with axial rotation of the fiber

Delgado

Bessa

2018

Micro & Optical Tech Letters

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We present a novel technique for manufacturing a long‐period fiber grating (LPFG) with enhanced torsion sensitivity based on electric arc technique. The proposed method rotates the fiber around its axis of rotation at each electric arc discharge. We experimentally investigated the torsion‐dependent spectral response of the produced grating and the results showed that an enhanced linear torsion sensitivity up to 0.197 nm/(rad/m) was achieved, which is higher than that of the conventional arc‐induced LPFGs.

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Torsion-induced effects on UV long-period fiber gratings

Cited by 14 publications

References 0 publications

Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review

Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review

Phase-shifted helical long-period grating-based temperature-insensitive optical fiber twist sensors

Torsion‐dependent spectral response of long‐period fiber grating based on electric arc technique with axial rotation of the fiber

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