Optical-Based Sensors for Monitoring Corrosion of Reinforcement Rebar via an Etched Cladding Bragg Grating

Abstract

In this paper, we present the development and testing of an optical-based sensor for monitoring the corrosion of reinforcement rebar. The testing was carried out using an 80% etched-cladding Fibre Bragg grating sensor to monitor the production of corrosion waste in a localized region of the rebar. Progression of corrosion can be sensed by observing the reflected wavelength shift of the FBG sensor. With the presence of corrosion, the etched-FBG reflected spectrum was shifted by 1.0 nm. In addition, with an increase in fringe pattern and continuously, step-like drop in power of the Bragg reflected spectrum was also displayed.

The Capability of Fiber Bragg Grating Sensors to Measure Amputees’ Trans-Tibial Stump/Socket Interface Pressures

“…The F-Socket array involves very thin sensors placed in situ at stump/socket interface, enabling measurements to be made without the need of a modified socket, but these sensors does not account for shear stresses and may crinkle and fail. On the other hand, the FBG sensors have prominent advantages over conventional measurement systems, such as their small size, light weight, flexibility, inherent safety, multiplexing capabilities, electromagnetic interference immunity, high spatial resolution, and high accuracy and sensitivity, in particular, for monitoring dynamic strain [9–12]. …”

Reinforced concrete structural corrosion monitoring using Hi-Bi photonic crystal fibres in a fiber loop structure

“…Long period grating (LPG)-based techniques have also been reported for monitoring the corrosion of reinforcement in concrete which take full advantage of fibre sensitivity to the refractive index variation of the surrounding environment caused by the changes in ion concentrations [4]. More recently, strain measurements using Fibre Bragg Gratings (FBGs) have been reported, in an attempt to directly monitor the corrosion at the steel-concrete interface [5][6].…”

In-line fiber Bragg grating sensors for steel corrosion detection

“…FBG sensors have advantages over other sensors such as high sensitivity, inert to most of natural substances, large dynamic range, and long durability, which make it a strong candidate in strain monitoring field. Several studies has already successfully used FBG sensors in monitoring stress/strain level in reinforced concrete [11][12][13][14][15] . The results matched expectation well: corrosion products would induce a large amount of strain (varies from 300 ~ 2500 ε in different experiment set-up scenarios) in concrete, and the initiation of corrosion attack can be demonstrated by FBG sensors.…”