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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.


TFBG setup for twist/rotation measurements employing FBG’s inscribed in multi-mode fiber.
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sensors-17-00443-f024: TFBG setup for twist/rotation measurements employing FBG’s inscribed in multi-mode fiber.

Mentions: Reference [99] describes torsion sensors based on TFBG inscribed into multimode fibers (Figure 24). Multiple high-order core modes can be excited by the TFBG inscribed in an MMF and they show a well-defined “comb” of resonances which are well separated from each other spectrally (this provides an easy way to isolate them at different wavelengths). Because the introduction of tilted grating has the effect of breaking the circular symmetry of the fiber locally, the coupling of asymmetric modes (LP1m) depends strongly on the polarization orientation related to the tilted plane, while the symmetric modes (LP0m) do not. In [99], a selective launch of symmetric modes (predominately fundamental modes) was performed by splicing of the (launching) SM fiber to the multimode fiber.


Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review †
TFBG setup for twist/rotation measurements employing FBG’s inscribed in multi-mode fiber.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

sensors-17-00443-f024: TFBG setup for twist/rotation measurements employing FBG’s inscribed in multi-mode fiber.
Mentions: Reference [99] describes torsion sensors based on TFBG inscribed into multimode fibers (Figure 24). Multiple high-order core modes can be excited by the TFBG inscribed in an MMF and they show a well-defined “comb” of resonances which are well separated from each other spectrally (this provides an easy way to isolate them at different wavelengths). Because the introduction of tilted grating has the effect of breaking the circular symmetry of the fiber locally, the coupling of asymmetric modes (LP1m) depends strongly on the polarization orientation related to the tilted plane, while the symmetric modes (LP0m) do not. In [99], a selective launch of symmetric modes (predominately fundamental modes) was performed by splicing of the (launching) SM fiber to the multimode fiber.

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.