Simulation of Microwave Non Destructive Testing environment (MNDT) in determining the dielectric constant of concrete using waveguide port approximation at 8–12GHz (X-band)

Abstract

This paper reports on a method to determine the dielectric constant of a concrete block using a Microwave Non Destructive Testing (MNDT) at X-band frequency through simulations. Besides the dielectric constant, the behaviour of wave propagating through a Gaussian Optic Lens antenna and the concrete blocks were also analysed. An MNDT environment was modelled using a waveguide port approximation technique using CST Microwave Studio. Transient solver was chosen in order to obtain the broadband frequency behaviour of the simulated device from only one calculation run. Results from simulated 10 concrete blocks were observed and analysed. From the simulation, the average value of dielectric constant is 2.5874 and the average percentage error between simulation and real measurement is 0.24754% Keywords -Computer SimulationTechnology (CST), Microwave Non Destructive Testing (MNDT), 8-12GHz (XBand), Concrete Block, Dielectric Constant and Transient Solver.

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“…MNDT is widely utilized for material testing that encompasses the development of sensors, probes, procedures, and calibration techniques for employing microwaves to find defects, fractures, and moisture content [18]. The approach has been thoroughly studied in other fields, like civil engineering, where much of the research has centered on concrete [19], [20]. Researchers in the field of food technology have used MNDT to identify fruit states and assess their freshness [21].…”

Microwave non-destructing testing of rubber at X-band

“…MNDT is a type of FSMM, which can be used to measure electrical parameters such as complex permittivty and permeability, and resistivity as a function of frequency and temperature [6]. MNDT have advantages over other NDT methods offering high accuracy and good penetration in non-metallic materials [7]. Since it is conducted in free-space, measurements using MNDT are contactless, i.e.…”