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

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.


TFBG setup for rotation measurement.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5375729&req=5

sensors-17-00443-f023: TFBG setup for rotation measurement.

Mentions: The capability of a TFBG to encode input E-field vector orientation into a distinctive spectral response can be applied straightforwardly in the E-field displacement type of rotation sensors. A common rotation sensor setup that utilizes TFBGs thus consists of a polarized optical source, lead-in fiber, in-line fiber polarizer, a section of sensing (circularly symmetric) SM fiber (usually standard SMF), a TFBG, a spectrum analyzer, and lead-out fiber, as shown in Figure 16f, where the section of the sensing SMF fiber with TFBG at its end are exposed to measured twist/rotation. When the rotational alignment between source/polarizers and TFBG is changed, the E-field vector spatial orientation incident onto the TFBG is also changed, which modulates resonance dips in the transmitted optical spectrum. The polarizer in the system can be either all-fiber, bulk/micro-optic [94] or another 45° TFBG [95] (Figure 23).


Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review †
TFBG setup for rotation measurement.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

sensors-17-00443-f023: TFBG setup for rotation measurement.
Mentions: The capability of a TFBG to encode input E-field vector orientation into a distinctive spectral response can be applied straightforwardly in the E-field displacement type of rotation sensors. A common rotation sensor setup that utilizes TFBGs thus consists of a polarized optical source, lead-in fiber, in-line fiber polarizer, a section of sensing (circularly symmetric) SM fiber (usually standard SMF), a TFBG, a spectrum analyzer, and lead-out fiber, as shown in Figure 16f, where the section of the sensing SMF fiber with TFBG at its end are exposed to measured twist/rotation. When the rotational alignment between source/polarizers and TFBG is changed, the E-field vector spatial orientation incident onto the TFBG is also changed, which modulates resonance dips in the transmitted optical spectrum. The polarizer in the system can be either all-fiber, bulk/micro-optic [94] or another 45° TFBG [95] (Figure 23).

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.