Abstract
The local acoustic resonance spectroscopy (LARS) is a novel nondestructive testing (NDT) technique that is based on the well-known coin-tap** test. This rather old test utilizes the effect that a defect (such as a large void, crack, or delamination), that is invisible from the surface, causes a change of acoustic waves emitted from the structure as a person taps on it – e.g., using a coin or a small hammer. This procedure has obvious drawbacks as it depends strongly on the skills – tap** correctly and listening carefully to the sound emitted – of an experienced person who needs to apply this simple technique by hand being close to the structure. Proper interpretation of the emitted sound is often difficult – even for experienced investigators. However, the benefits of easy implementation, relatively fast surveying, and cost-efficiency are evident as well. This was the motivation for the instrumentation of this technique, where all steps are automated, including a contact-free recording microphone and a robot-based instrumented excitation of the component under test. The technique can be locally applied to structures constructed from fiber-reinforced polymers and uses the acoustic waves that are analyzed in the frequency domain according to resonance peak content. For industrial applications, LARS can be used as a rapid but reliable NDT technique to obtain an initial overview about larger defects in a structure prior to implementing more detailed investigations, thus raising the escalation level of quality control.
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Grosse, C.U., Jüngert, A., Jatzlau, P. (2019). Local Acoustic Resonance Spectroscopy. In: Ida, N., Meyendorf, N. (eds) Handbook of Advanced Nondestructive Evaluation. Springer, Cham. https://doi.org/10.1007/978-3-319-26553-7_21
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