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.


(a) E-field vector orientation remains unchanged during propagation through isotropic medium; (b) Rotation of the receiver rotates E-field vector in receiver’s local coordinate system.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

sensors-17-00443-f015: (a) E-field vector orientation remains unchanged during propagation through isotropic medium; (b) Rotation of the receiver rotates E-field vector in receiver’s local coordinate system.

Mentions: Arguably, this is the most basic, and perhaps the most straightforward, approach to the twist/rotation sensing that utilizes electromagnetic radiation. When a linearly polarized electromagnetic wave is generated in a reference frame which is filled with homogenous and isotropic medium, the wave’s E-field vector orientation in the reference frame will remain unchanged over the entire path of the wave’s propagation (homogenous isotropic medium cannot change the polarization state of a propagating electromagnetic wave (Figure 15a). Thus, if a linearly polarized source and polarization sensitive receiver are placed collinearly at an arbitrary distance, rotation of the receiver relative to the source will cause rotation of the E-field impeding at the receiver. Thus, measurement of E-field vector orientation direction at the receiver provides direct information on rotational displacement between the transmitter and receiver (Figure 15b).


Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review †
(a) E-field vector orientation remains unchanged during propagation through isotropic medium; (b) Rotation of the receiver rotates E-field vector in receiver’s local coordinate system.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

sensors-17-00443-f015: (a) E-field vector orientation remains unchanged during propagation through isotropic medium; (b) Rotation of the receiver rotates E-field vector in receiver’s local coordinate system.
Mentions: Arguably, this is the most basic, and perhaps the most straightforward, approach to the twist/rotation sensing that utilizes electromagnetic radiation. When a linearly polarized electromagnetic wave is generated in a reference frame which is filled with homogenous and isotropic medium, the wave’s E-field vector orientation in the reference frame will remain unchanged over the entire path of the wave’s propagation (homogenous isotropic medium cannot change the polarization state of a propagating electromagnetic wave (Figure 15a). Thus, if a linearly polarized source and polarization sensitive receiver are placed collinearly at an arbitrary distance, rotation of the receiver relative to the source will cause rotation of the E-field impeding at the receiver. Thus, measurement of E-field vector orientation direction at the receiver provides direct information on rotational displacement between the transmitter and receiver (Figure 15b).

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.