Optical Fiber Sensors for Structural Health Monitoring

Analysis of Fibre Bragg Gratings Sensors Optimal Placement for Monitoring of Damage Propagation in Laminate Composites

“…The popular solution is to construct a structural health monitoring (SHM) system based on optical fibres with Bragg gratings. Fibre Bragg grating is formed by inducing a periodic modulation of the refractive index in the core of a single mode optical fibre [5,6]. Thus, FBG filters a broadband light, which is transmitted into the fibre core, reflecting light at a single wavelength [7,8].…”

Structural Health Monitoring for Composite Materials

“…FBG is formed by inducing a periodic modulation of the refractive index in the core of a single mode optical fiber [10]. When light within a fiber passes through a FBG, constructive interference between the forward and contra-propagating light waves happens and leads to the narrowband back-reflection of light with Bragg wavelength B  .…”

“…Any local changes along with FBG can be manifested as that of B  and therefore, from the measurement of the transmitted or reflected spectrum, as shown in figure 2, it is possible to monitor any strain-resulting parameters from temperatures to stress waves [9][10][11]. The major advantage of the sensor is that an array of wavelength-multiplexed FBGs can be deployed in a single fiber for quasi-distributed measurement.…”

Nanotechnology and Development of Strain Sensor for Damage Detection

“…to ensure safe and durable service life of the structures [13][14][15][16][17][18]. So, vast research had been carried out during the past years to develop SHM sensors, and this development took place gradually over time from strain gages, fiber optic sensors, and piezoelectric sensors to microelectromechanical systems (MEMSs) [19][20][21]. But they all have some limitations such as strain gauges behave as defects or inclusions, fiber optic sensors require lot of instrumentation and data analysis, brittle material is used in manufacturing piezoelectric sensors, and MEMSs are manufactured at microscale, which makes the manufacturing process difficult [22][23][24][25].…”