Residual strain measurement and impact response of optical fibre Bragg grating sensors in fibre metal laminates

Abstract

Recently, optical fibre Bragg gratings have attracted a significant amount of attention as optical fibre sensors for measuring strain in composite structures. Indeed, the growth of optical fibre technology has spurred the development of smart composites capable of measuring real-time internal strain within structures and an assortment of measurands such as temperature, pressure and chemical. In this paper, optical fibre Bragg grating sensors are embedded in a novel fibre-metal laminate composite, to demonstrate the potential of fibre Bragg grating sensors in measuring post-processing residual strain within a multimaterial structure. Repeated impact tests in the region of the grating have been performed to investigate the survivability of the sensor. In addition, post-impact sensor linearity tests have then been carried out to evaluate the sensor response to load.

The plastic optical fiber cantilever beam as a force sensor

“…[1][2][3][4][5][6][7][8][9][10][11][12]. These internal WLAN antennas include the slot antenna [2], the traditional metal-plate or printed PIFA (planar inverted-F antenna) with a direct feed [3][4][5][6], the monopole antenna [7][8][9][10][11], the coupled-fed PIFA [12], and so on. These reported WLAN antennas [2][3][4][5][6][7][8][9][10][11], however, generally show a width of about 20 mm or larger along the top edge of the system ground plane or the supporting metal frame of the laptop display, when embedded inside the laptop computers.…”

“…Such structures are capable of providing vital information concerning the integrity of engineering structures through the use of embedded or surface bond sensors. Amongst the various methods available, optical fiber sensing systems have attracted considerable attention [1][2][3].…”

Effective Methods for Structural Health Monitoring of Critical Zones of Scalable Wind Turbine Blades

“…SHM includes the use of FBG for detecting delamination in composite laminates [29] and monitor impact event occurrence [30,31]. A FBG is a periodic or semiperiodic permanent perturbation of the fiber core refractive index.…”

Integration of complementary methods for monitoring stress/strain of wind turbine blades structures

“…SHM includes the use of FBG for detecting delamination in composite laminates [13] and monitor impact event occurrence [14]. [15].…”