Temperature-insensitive simultaneous rotation and displacement (bending) sensor based on tilted fiber Bragg grating

Abstract

In this paper, we present a method for the simultaneous measurement of rotation and displacement or rotation and bending using single tilted fiber Bragg grating (TFBG). The insensitivity of the proposed system to temperature changes and the stretching direction of the fiber section in the sensing structure have been demonstrated. The experimentally determined sensitivities for rotation, displacement and bending are as follows: -0.0018 1/deg., 0.0054 nm/mm, and -0.055 1/mm over the measurement ranges of approximately 25-80 degrees, 34-74 mm, and 26.4-20 mm, respectively. The presented measurement system is versatile due to the ability to tune the measurement range by changing the fiber-loop radius.

Multiparameter fiber-optic sensors: a review

“…A sensor for simultaneous rotation and displacement (bending) measurement based on a tilted FBG is described in Ref. 86. Cladding modes are sensitive to torsional fiber/ twist due to the stress build up in the cladding that is induced by fiber rotational twisting.…”

“…The method described in Ref. 86 observes selected cladding mode resonances, which exhibit different sensitivities to the curvature and rotation and are correlated further to the rotation and curvature of fiber bending. A very similar approach is presented in Ref.…”

Generation of Orbital Angular Momentum Modes Using Fiber Systems

“…Optical fiber gratings, a diffraction grating formed by the axially periodic refractive index modulation of fiber core using a certain method, have been developed into a mature technology and have been widely used in optical communications and fiber sensing in recent decades [55]. It is well-known that optical fiber gratings can be classified into two types, that is, fiber Bragg grating (FBG) [56] and long-period fiber grating (LPFG) [57][58][59][60][61][62][63][64][65][66][67][68], according to the grating period.…”

Bend-Direction and Rotation Plastic Optical Fiber Sensor

“…The interference between two supermodes excited in the MCF has been used to obtain an interferometric strain sensor. Multi-parameter sensors for rotation and bending are reported in the literature as well [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”