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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.


Each polarization state (Ey and Ex) yielding to different resonant solution due to its corresponding orientation.
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sensors-17-00443-f021: Each polarization state (Ey and Ex) yielding to different resonant solution due to its corresponding orientation.

Mentions: The principal property that makes TFBGs interesting for twist/rotation measurements belongs to the grating’s ability to break the local circular symmetry of the fiber, which makes resonant coupling between the core and the cladding modes depend on the incoming E-field vector orientation. This leads to two distinctive sets of resonant coupling conditions/wavelengths (each set consists of multiple resonance wavelengths at which coupling occurs between fundamental and multitude of cladding modes): One set for the case when the incident E-field vector is parallel to the grating’s tilt plane, and one set for the case when the E-field vector is parallel with the plane normal to the grating’s tilt plane (Figure 21).


Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review †
Each polarization state (Ey and Ex) yielding to different resonant solution due to its corresponding orientation.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

sensors-17-00443-f021: Each polarization state (Ey and Ex) yielding to different resonant solution due to its corresponding orientation.
Mentions: The principal property that makes TFBGs interesting for twist/rotation measurements belongs to the grating’s ability to break the local circular symmetry of the fiber, which makes resonant coupling between the core and the cladding modes depend on the incoming E-field vector orientation. This leads to two distinctive sets of resonant coupling conditions/wavelengths (each set consists of multiple resonance wavelengths at which coupling occurs between fundamental and multitude of cladding modes): One set for the case when the incident E-field vector is parallel to the grating’s tilt plane, and one set for the case when the E-field vector is parallel with the plane normal to the grating’s tilt plane (Figure 21).

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.