Vibro-Thermal Wave Radar: Application of Barker Coded Amplitude Modulation for Enhanced Low-Power Vibrothermographic Inspection of Composites.
In: Materials (Basel, Switzerland), Jg. 14 (2021-05-07), Heft 9
Online
academicJournal
Zugriff:
This paper proposes an efficient non-destructive testing technique for composite materials. The proposed vibro-thermal wave radar (VTWR) technique couples the thermal wave radar imaging approach to low-power vibrothermography. The VTWR is implemented by means of a binary phase modulation of the vibrational excitation, using a 5 bit Barker coded waveform, followed by matched filtering of the thermal response. A 1D analytical formulation framework demonstrates the high depth resolvability and increased sensitivity of the VTWR. The obtained results reveal that the proposed VTWR technique outperforms the widely used classical lock-in vibrothermography. Furthermore, the VTWR technique is experimentally demonstrated on a 5.5 mm thick carbon fiber reinforced polymer coupon with barely visible impact damage. A local defect resonance frequency of a backside delamination is selected as the vibrational carrier frequency. This allows for implementing VTWR in the low-power regime (input power < 1 W). It is experimentally shown that the Barker coded amplitude modulation and the resultant pulse compression efficiency lead to an increased probing depth, and can fully resolve the deep backside delamination.
Titel: |
Vibro-Thermal Wave Radar: Application of Barker Coded Amplitude Modulation for Enhanced Low-Power Vibrothermographic Inspection of Composites.
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Autor/in / Beteiligte Person: | Hedayatrasa, S ; Segers, J ; Poelman, G ; Paepegem, WV ; Kersemans, M |
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Zeitschrift: | Materials (Basel, Switzerland), Jg. 14 (2021-05-07), Heft 9 |
Veröffentlichung: | May 2010- : Basel, Switzerland : MDPI ; <i>Original Publication</i>: Basel, Switzerland : Molecular Diversity Preservation International, 2008-2010., 2021 |
Medientyp: | academicJournal |
ISSN: | 1996-1944 (print) |
DOI: | 10.3390/ma14092436 |
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