The goal of this study was to develop an impact-echo device that can conduct automatic\noscillation tests, process signals rapidly, and apply it to concrete object anomaly analysis. The system\npresented in this study comprises three parts, namely the impact device, the oscillator circuit,\nand signal processing software. The design concept of the impact-echo device was inspired by\na pendulum clock, and its implementation used a nondestructive wooden hammer instead of a\nconventional manual steel hammer. In this study, we used a pulse generator in the adjustable\noscillator circuit to produce delayed changes. The delayed changes would activate the wooden\nhammer that struck the surface of the object. To process the signal, our lab used a built-in sound card\nin the computer to transfer the reflection soundwave from striking the wall to MATLAB software to\nanalyze the energy of the frequency spectrum. This was conducted to evaluate whether the object\ncontained anomalies and, if so, to determine the location of the anomalies to serve as a reference for\nreal-life implementation.
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