Wavelet Processing of Continuous Scanning Laser Doppler Vibrometry data in Non-Destructive Testing

22nd AIVELA Annual Meeting

Chiariotti, P.^1 ; Revel, G.M.^1 ; Martarelli, M.^2

Università Politecnica Delle Marche, via Brecce Bianche, Ancona

60131, Italy^1

Università Degli Studi E-Campus, via Isimbardi, Novedrate (CO), Italy^2

关键词: Continuous scanning laser Doppler vibrometry;    Extraction capability;    Mother wavelets;    Non destructive testing;    Shannon entropy;    Spatial sampling;    Wavelet energy;    Wavelet processing;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/658/1/012001/pdf
DOI  :  10.1088/1742-6596/658/1/012001

来源: IOP

【 摘 要 】

The present paper proposes a novel non-destructive testing procedure based on the exploitation of the simultaneous time and spatial sampling provided by Continuous Scanning Laser Doppler Vibrometry (CSLDV) and the feature extraction capabilities of wavelet-based processing. Two criteria for selecting in an objective way the mother-wavelet to be used in the decomposition procedure, the Relative Wavelet Energy and Energy to Shannon Entropy Ratio, are compared in terms of capability of best locating the damage. The paper demonstrates the applicability of the procedure for the identification of superficial and in-depth defects in simulated and real test cases when an area scan is performed over the test sample. The method shows promising results, since defects are identified in different severity conditions.