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Resonant Airborne Acoustic Emission for Nondestructive Testing and Defect Imaging in Composites

期刊

APPLIED SCIENCES-BASEL
卷 11, 期 21, 页码 -

出版社

MDPI
DOI: 10.3390/app112110141

关键词

Local Defect Resonance; Resonant Air-Coupled Emission; acoustic camera

资金

  1. DFG [KR 31 2131/12-1]

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The article discusses two different acoustic emission modes for nondestructive testing, one based on defects generating acoustic waves at resonant frequency, and the other using noise-like signals for wideband activation. These methods are applicable to detect and image various defects in composites, with full-field imaging achieved through an array of microphones.
A new version of an acoustic emission mode which is different from its traditional counterpart is discussed in view of applications for nondestructive testing. It is based on the effect of acoustic waves generation from the defect area in ambient air by local standing wave vibration developed in this area at the defect resonant frequency. Another approach which does not require preliminary knowledge of local defect-resonance frequency is one that uses wideband acoustic activation by a noise-like input signal. The acoustic emission field from the defect area is a fingerprint of the radiation source, and thus is applicable to defect detection and imaging. This enables the use of commercial microphone scanning for detecting and imaging various defects in composites. An improvement in the acoustic-emission scanning mode based on a multiple-axis robot is studied to applications to complex shape components. A rapid, full-field imaging of the acoustic-emission field is implemented by means of an array of microphones (acoustic camera). Numerous case studies validate the potential of the resonant acoustic-emission modes for integration in the defect imaging system based on inexpensive, fully acoustic instrumental components.

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