Ultrasonics (waves with frequencies beyond the audible range) is been used widely in many fields of engineering, e.g. material characterization, structure health monitoring, as well as medical diagnosis. Non-Destructive Testing (NDT) of materials is one of the areas that uses ultrasonics to send sound waves of short wavelength but in a high frequency to detect delamination, cracks, and to measure the elastic constants of a material such as Young’s modulus E and Poisson’s ratio υ.
The aim of this thesis is to develop computer controlled practicals and demonstration experiments for the application of ultrasonics in NDT, and to produce detailed practical descriptions for each of the three practicals. The three practicals are: 1) Waves in a Rod, 2) Waves in a Stepped Rod, and 3) Waves in a 3-D Solid. The practicals will look into the type of waves that are propagating through a rod, the energy transmitted and reflected when a wave passes through a general interface, and how to get the material’s elastic constant by just sending sound wave into the material respectively. These practicals aim to help the student understand the fundamentals of wave propagation and it also allows the student to put into practice what they have learned in the lectures.
LabView® is used for the development of each program for the practicals. LabView is a registered trademark of National Instruments. LabView is a computer program, which uses ‘G’ or graphical programming language. The developed program will aid the students in data acquisition, calculating and displaying out the time differences (Δt) for each maximum peak per pulse, and it allows the data to be saved in spreadsheet format thus enabling students to bring home the taken data.