Development of electrical capacitance sensor for non-destructive test on composite

Mohd Fuzi, Muhammad Afif Hanafi (2021) Development of electrical capacitance sensor for non-destructive test on composite. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Today, new powerful appliances and instruments, and simple techniques for the application of NDT methods in the qualitative control of materials and manufacturing, are being developed. Nondestructive Testing (NDT) consists of a variety of non-invasive inspection techniques used to evaluate material properties, components, or entire process units. The techniques can also be utilized to detect, characterize, or measure the presence of damage mechanisms. Many NDT techniques are capable of locating defects and determining the features of the defects, such as their size, shape, and orientation. We applied Non-contact capacitive sensors work by measuring changes in an electrical property called capacitance. Capacitance describes how two conductive objects with a space between them respond to a voltage difference applied to them. If the polarity of the voltage is reversed, the charges will also reverse.Capacitive sensors use an alternating voltage which causes the charges to continually reverse their positions. The moving of the charges creates an alternating electric current which is detected by the sensor. current flow is determined by the capacitance, and the capacitance is determined by the area and proximity of the conductive objects. The capacitance is also affected by the type of nonconductive material in the gap between the objects. For the implementation of this project, the use of COMSOL Multiphysics computer software can build the design of the capacitive parallel plate as the main design needed to detect and release different readings on composite items that will serve as a testament to being placed in the middle of the parallel plate. Thus, the production of data released with different capacitance readings on each item can classify the types of composites that are included in detecting damage or cracks in the composite material as the main objective of this project.

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