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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.


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Torsion sensor employing Mach-Zehnder LPFBG in fiber ring laser configuration.
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sensors-17-00443-f013: Torsion sensor employing Mach-Zehnder LPFBG in fiber ring laser configuration.

Mentions: Modal interferometers can utilize coupling among guided modes [67], guided and cladding modes [68,70,71,72] or a combination of both approaches [69]. While solid core fibers can be used to build torsion sensitive fiber modal interferometers [72], most solutions utilize PCF, mainly to achieve low temperature sensitivity [67,68,69,70,71]. A rather special case of modal interferometer is the solution presented in [73], where a large square core fiber is applied as a multimode interferometer for twist/rotation sensing. Another case of twist modal interferometer was presented in [73], where a twisted taper pair is produced within polarization maintaining fiber to provoke core-cladding torsion sensitive interference. Fiber Mach-Zehnder Interferometers (MZI) can also be built by using LFBGs. One example of a torsion sensor was demonstrated in [50], where two cascaded R-LPFBGs formed a torsion-sensitive region, which was demodulated with a fiber ring laser. This solution provides a narrow laser linewidth with high side-mode suppression ratio, which increased the torsion measurement resolution significantly (Figure 13). A similar approach was described in [76], where the authors formed a cascaded LPFBG in Polarization-Maintaining (PM) fibers. An additional example of MZI was also presented in [77], where the authors cascaded two identical Helical Long Period Fiber Gratings (H-LPFBGs).


Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review †
Torsion sensor employing Mach-Zehnder LPFBG in fiber ring laser configuration.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

sensors-17-00443-f013: Torsion sensor employing Mach-Zehnder LPFBG in fiber ring laser configuration.
Mentions: Modal interferometers can utilize coupling among guided modes [67], guided and cladding modes [68,70,71,72] or a combination of both approaches [69]. While solid core fibers can be used to build torsion sensitive fiber modal interferometers [72], most solutions utilize PCF, mainly to achieve low temperature sensitivity [67,68,69,70,71]. A rather special case of modal interferometer is the solution presented in [73], where a large square core fiber is applied as a multimode interferometer for twist/rotation sensing. Another case of twist modal interferometer was presented in [73], where a twisted taper pair is produced within polarization maintaining fiber to provoke core-cladding torsion sensitive interference. Fiber Mach-Zehnder Interferometers (MZI) can also be built by using LFBGs. One example of a torsion sensor was demonstrated in [50], where two cascaded R-LPFBGs formed a torsion-sensitive region, which was demodulated with a fiber ring laser. This solution provides a narrow laser linewidth with high side-mode suppression ratio, which increased the torsion measurement resolution significantly (Figure 13). A similar approach was described in [76], where the authors formed a cascaded LPFBG in Polarization-Maintaining (PM) fibers. An additional example of MZI was also presented in [77], where the authors cascaded two identical Helical Long Period Fiber Gratings (H-LPFBGs).

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.


Related in: MedlinePlus