Capacitance-Based Technique for Detection of Reinforcement Bars in Concrete Structures

The semi-analytical model of capacitive imaging (CI) sensors based on the renormalization group method

“…This analytical model can effectively evaluate the maximum penetration depth of the coplanar capacitive sensor (Islam et al, 2021). Abdelhafeez et al (2020) applied the coplanar (2014,2016) applied the renormalization group method, which solves nonlinear problems in condensed matter physics, to the solution of planar capacitance sensors. This method eliminates the difficult task of summing infinite series in the analytical model and ultimately derives a semianalytical model for planar rectangular capacitance sensors.…”

“…This analytical model can effectively evaluate the maximum penetration depth of the coplanar capacitive sensor (Islam et al , 2021). Abdelhafeez et al (2020) applied the coplanar capacitive sensor to the detection of steel bars in concrete structures, and they established a theoretical model of the coplanar capacitive sensor using topological structures and achieved the optimization design of coplanar capacitive sensor parameters through this theoretical model. Chen et al (2010, 2011) proposed a model of a concentric coplanar capacitive sensor, derived the electrostatic Green’s function for an external point source on the dielectric rod and established the theoretical model of the concentric coplanar capacitive sensor based on the method of moments and electrostatic Green’s function.…”

Experimental Study and FEM Simulations for Detection of Rebars in Concrete Slabs by Coplanar Capacitive Sensing Technique

“…Reinforced concrete (RC) has been the most commonly used building material in civil engineering structures for over a century because it is cost-effective, durable and can be cast in any shape. The distribution of rebars inside RC structures is controlled by design and is carefully selected to provide the necessary strength to withstand all loads applied to the RC elements [ 1 , 2 ]. Sometimes, knowing the location of the rebars in the RC structures (usually, after the concrete has hardened) is important to analyse the quality of new elements and/or to verify the condition of existing structures for which design details are lacking [ 3 ].…”

“…Ground penetrating radar (GPR) is the widely used technique for recognizing the location and depth of buried rebars in RC structures [ 9 , 10 ]. Although this technique has a significant penetration depth [ 11 ], it is specified that it has a low accuracy and that the measured data require intensive processing for interpretation [ 1 ].…”