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

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ABSTRACT

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.

No MeSH data available.


(a) Polarization plane and fiber direction when fiber is not twisted and (b) When fiber is twisted through 100°, the polarization plane is rotated through 7° in the opposite direction.
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sensors-17-00443-f001: (a) Polarization plane and fiber direction when fiber is not twisted and (b) When fiber is twisted through 100°, the polarization plane is rotated through 7° in the opposite direction.

Mentions: For example, if polarized light is launched into a single-mode fiber on one fixed end, and if the same fiber is twisted around its z-axis, the polarization plane at the output of the fiber will be rooted with a rate of 0.069° per degree of the fiber’s mechanical rotation (Figure 1). This manifestation of polarization rotation in single-mode fibers was investigated in different references [4,7]. The direct observation of this polarization rotation would require a rotary joint or similar mechanical free-space coupling between the twisted and lead-out fiber, which would probably be impractical for sensor implantation.


Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review †
(a) Polarization plane and fiber direction when fiber is not twisted and (b) When fiber is twisted through 100°, the polarization plane is rotated through 7° in the opposite direction.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5375729&req=5

sensors-17-00443-f001: (a) Polarization plane and fiber direction when fiber is not twisted and (b) When fiber is twisted through 100°, the polarization plane is rotated through 7° in the opposite direction.
Mentions: For example, if polarized light is launched into a single-mode fiber on one fixed end, and if the same fiber is twisted around its z-axis, the polarization plane at the output of the fiber will be rooted with a rate of 0.069° per degree of the fiber’s mechanical rotation (Figure 1). This manifestation of polarization rotation in single-mode fibers was investigated in different references [4,7]. The direct observation of this polarization rotation would require a rotary joint or similar mechanical free-space coupling between the twisted and lead-out fiber, which would probably be impractical for sensor implantation.

View Article: PubMed Central - PubMed

ABSTRACT

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.

No MeSH data available.