A comparison of different NDE signal processing techniques based on waveform entropies applied to long fiber-graphite/epoxy-plates

Michael Larche, Mathew Prowant, Paul Bruillard, Tobias Hagge, Leonard S. Fifield, Michael Hughes, Xin Sun

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study compares di?€erent approaches for imaging the internal architecture of graphite/epoxy composites using backscattered ultrasound. Two cases are studied. In the first, near-surface defects in a thin graphite/epoxy plates are imaged. The backscattered waveforms were used to produce peak-to-peak, logarithm of signal energy, as well as entropy images of di?€erent types. All of the entropy images exhibit better border delineation and defect contrast than either the peak-to-peak or the logarithm of signal energy. The best results are obtained using the joint entropy of the backscattered waveforms with a reference function. Two di?€erent references are examined. The first is a reflection of the insonifying pulse from a stainless steel reflector. The second is an approximate optimum obtained from an iterative parametric search. The joint entropy images produced using this reference exhibit three times the contrast obtained in previous studies. These plates were later destructively analyzed to determine size and location of near-surface defects and the results are found to agree with the defect location and shape as indicated by the entropy images. In the second study, images of long carbon fibers (50% by weight) in polypropylene thermoplastic were obtained as a first step toward ultrasonic determination of the distributions of fiber position and orientation.

Original languageEnglish (US)
Title of host publicationNondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017
PublisherSPIE
Volume10169
ISBN (Electronic)9781510608238
DOIs
StatePublished - 2017
Externally publishedYes
EventConference on Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XI 2017 - Portland, United States

Other

OtherConference on Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XI 2017
CountryUnited States
CityPortland
Period3/26/173/29/17

Fingerprint

Entropy
entropy
Hemophilia A
Graphite
Epoxy
Waveform
waveforms
Surface defects
Logarithm
Defects
Fiber
Energy
surface defects
logarithms
graphite
fibers
defects
energy
Ultrasonics
Aerobiosis

Keywords

  • Composites
  • Entropy Imaging
  • Graphite/Epoxy
  • Information Imaging
  • Joint Entropy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Larche, M., Prowant, M., Bruillard, P., Hagge, T., Fifield, L. S., Hughes, M., & Sun, X. (2017). A comparison of different NDE signal processing techniques based on waveform entropies applied to long fiber-graphite/epoxy-plates. In Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017 (Vol. 10169). [101690T] SPIE. DOI: 10.1117/12.2260490

A comparison of different NDE signal processing techniques based on waveform entropies applied to long fiber-graphite/epoxy-plates. / Larche, Michael; Prowant, Mathew; Bruillard, Paul; Hagge, Tobias; Fifield, Leonard S.; Hughes, Michael; Sun, Xin.

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017. Vol. 10169 SPIE, 2017. 101690T.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Larche, M, Prowant, M, Bruillard, P, Hagge, T, Fifield, LS, Hughes, M & Sun, X 2017, A comparison of different NDE signal processing techniques based on waveform entropies applied to long fiber-graphite/epoxy-plates. in Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017. vol. 10169, 101690T, SPIE, Conference on Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XI 2017, Portland, United States, 26-29 March. DOI: 10.1117/12.2260490
Larche M, Prowant M, Bruillard P, Hagge T, Fifield LS, Hughes M et al. A comparison of different NDE signal processing techniques based on waveform entropies applied to long fiber-graphite/epoxy-plates. In Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017. Vol. 10169. SPIE. 2017. 101690T. Available from, DOI: 10.1117/12.2260490

Larche, Michael; Prowant, Mathew; Bruillard, Paul; Hagge, Tobias; Fifield, Leonard S.; Hughes, Michael; Sun, Xin / A comparison of different NDE signal processing techniques based on waveform entropies applied to long fiber-graphite/epoxy-plates.

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017. Vol. 10169 SPIE, 2017. 101690T.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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