Twist sensor based on Sagnac single-mode optic fiber interferometer

Liang, Houhui; Sun, Mingming; Jin, Yongxing

doi:10.1016/j.ijleo.2013.05.105

Cited by 17 publications

(7 citation statements)

References 11 publications

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“…When low birefringence fibers are utilized in twist/rotation sensor designs, these sensing fibers must possess sufficient initial birefringence to obtain the desired measurement effect. Thus, when an SMF type of fiber is utilized, linear birefringence must be induced through external fiber perturbation, for example, side pressure, as described in [14]. PCF fibers usually possess intrinsically sufficient linear birefringence that provides an opportunity for twist/rotation sensing as, for example, described in [15].…”

Section: Sensors Based On the Twist Induced Birefringence Modulatimentioning

confidence: 99%

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

Budinski

Đonlagić

2017

Sensors

112

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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: Sensors Based On the Twist Induced Birefringence Modulatimentioning

confidence: 99%

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

Budinski

Đonlagić

2017

Sensors

112

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“…Various fiber-optic sensors for measurement of torsion have been already reported in the literature. Possible approaches include the use of Sagnac interferometers [22,23,24], Mach-Zehnder interferometers [25,26], tilted fiber Bragg gratings [27,28], or long-period fiber gratings [29,30]. Since the first observation of resonant coupling between the core and cladding modes in chiral fiber gratings [3], such structures have been also studied for torsion sensing, either in a single- [31] or double-grating configuration [19].…”

Section: Introductionmentioning

confidence: 99%

Polarimetric Sensitivity to Torsion in Spun Highly Birefringent Fibers

Kowal

Statkiewicz-Barabach

Bernas

et al. 2019

Sensors

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We report on experimental studies of polarimetric sensitivity to torsion in spun highly birefringent fibers. Two classes of spun fibers were examined, namely spun side-hole fibers and birefringent microstructured fibers with different birefringence dispersion, spin pitches, and spin directions. The polarimetric sensitivity to torsion was determined by monitoring a displacement of the spectral interference fringes arising in the output signal because of interference of polarization modes and induced by an additional fiber twist. Both the experimental results and the analytical predictions showed that the sensitivity to torsion normalized to the fringe width in the spun highly birefringent fibers increased asymptotically with the twist rate to the value of 1/ π rad−1. We have also studied the polarimetric response to temperature in the spun side-hole fibers. We have found that, in contrast to the torsional sensitivity, the temperature sensitivity decays asymptotically to zero with increasing fiber twist rate. Therefore, the spun fibers with short spin pitches are especially well suited for torsion measurements because the torsional sensitivity and the range of linear response are both enhanced in such fibers, while at the same time, the cross-sensitivity to temperature is reduced.

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“…Torsional twisting of an optical fiber induces a torsional stress within the same fiber that results in a torsional elastic‐optic effect which, further, leads to the appearance of circular birefringence. Liang, Sun, and Jin () and Tentori and Garcia‐Weidner () designed an optical fiber twist sensor based on Sagnac single‐mode optic fiber interferometer. The stress‐induced birefringence of a single‐mode optical fiber is obtained by applying a transverse force against a short length of single mode fiber.…”

Section: Introductionmentioning

confidence: 99%

A novel dynamic opto‐thermo‐mechanical stress testing device 1: Design of the device

Sokkar

El‐Farahaty

El‐Bakary

et al. 2018

Microscopy Res & Technique

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This article presents a dynamic opto-thermo-mechanical stress testing device to characterize fiber properties. The device has multi-modes and consists of many functions. These modes include stretching, bending, rotating, twisting, and heating processes. Every process can be controlled by micro-controller unit via software programs specially designed for this purpose. The micro-controller unit can execute two different processes at the same time. Such as, dynamic stretching process under the effect of thermal treatment, dynamic stretching process and relaxation, bending process under the effect of thermal treatment, and so forth. Software programs with their flow charts are designed for the application of these processes. The advantage of this device is that it can be done statically and dynamically to characterize all types of fibers (polymer and optical). The device is designed to be attached with two-beam polarizing interference microscope to investigate the dynamic opto-thermo-mechanical properties of the tested fiber under the effect of different applied stresses. Isotactic polypropylene, iPP, fiber is used for some applications of this device, as examples, in stretching, rotation, and twisting modes. Interferograms and graphs are given for illustration.

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Twist sensor based on Sagnac single-mode optic fiber interferometer

Cited by 17 publications

References 11 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

Polarimetric Sensitivity to Torsion in Spun Highly Birefringent Fibers

A novel dynamic opto‐thermo‐mechanical stress testing device 1: Design of the device

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