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Manufactured parts are a staple of modern urban life, visible in homes (e.g., kitchen appliances), offices (e.g., printers), the automobile and aerospace industries (e.g., body parts), and more. This M.S. project intended to determine whether ultrasonic testing could be used in a simple and rapid manner to perform quality control of manufactured parts. Ultrasonic testing is employed for this purpose using two surface-coupled transducers, one being a transmitter and the other one a receiver. An ultrasonic pulse, which is generated by the transmitting transducer, propagates through the part, collecting information about material and geometry, as well as potential unwanted features. The resulting response is recorded at the receiving transducer for a long duration, i.e. until the wave amplitude has dampened out. Coda wave analysis, which studies the later portions of a recorded signal, is then used to compute a similarity index between a signal from a part and a signal from a reference part that has been examined and approved. Coda wave fields have been found significantly more sensitive to minute differences in two signals compared to the first wave arrival. This MS project report introduces the setup and instrumentation, testing methodology, coda wave analysis and similarity indices, and discusses the feasibility of the proposed approach on a set of manufactured parts made of different materials with different alterations. ULTRASONIC CODA WAVE COMPARISON FOR QUALITY CONTROL OF MANUFACTURED PARTS: PROOF OF FEASIBILITY

Ultrasonic Coda Wave Comparison for Quality Control of Manufactured Parts: Proof of Feasibility