Quasi-Distributed Directional Bending Sensor Based on Fiber Bragg Gratings Array in Triangle-Four Core Fiber

The role of optical fiber sensors in the new generation of healthcare devices: a review

“…58 They are also used in fiber optic sensors and quasi-distributed thermophysical measurements. 59 FBG sensors can be utilized in the design of flexible optical fiber sensors by encapsulating them with protective materials to ensure their functional integrity and survivability under harsh conditions or by engraving the Bragg gratings in POFs. 60,61 These sensors can be used in structural health monitoring of civil infrastructure, such as bridges, tunnels, and buildings, 62 mechanical deformation and temperature fluctuation monitoring in asphalt pavement, [63][64][65] temperature and dynamic strain in electrical machine monitoring, 66 realtime monitoring of the curing process of resin-based carbon fiber reinforced plastic and aluminum alloys, 67 and measurement of deformation accumulation and elastic recovery of materials in asphalt roads.…”

Strongly coupled multicore fiber with FBGs for multipoint and multiparameter sensing

“…Consequently, several identical or different sensors can be written at the same position along the length of the MCF, which is beneficial for simultaneous measurement of multiple parameters [14][15][16]. Therefore, multicore fiber Bragg grating (MCFBG) sensors have been proposed and successfully validated in a variety of mechanical parameters sensing, such as bending, twist, inclination, acceleration, or 3D shape sensing [17][18][19][20][21][22]. For instance, Gander et al reported the first demonstration of bend sensing using a pair of FBGs written in a two-core MCF [23].…”

Highly integrated sensors based on microstructured optical fibers

“…Hence, the FBG located at the fiber center is almost insensitive to bending. Nevertheless, some bending sensors were demonstrated by inscribing FBGs into eccentric cores [34][35][36]. The shift of Bragg reflection wavelength with a curvature in the eccentric-core fiber can be calculated as:…”