Laser-based ultrasonics on Gr/epoxy composite

Bernhard R. Tittmann, R. S. Linebarger, R. C. Addison

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Critical issues are examined in the application of laser generation and detection of ultrasound to the inspection of large area air-frame composites. Among these issues are surface roughness, signal-to-noise ratio, insensitivity to the path length between the part and detector, and wide band vs. narrow-band generation. Demonstrated is the feasibility of transmission C-scans of 150 ply Gr/epoxy panels containing simulated delaminations. Waveforms having a signal-to-noise ratio of greater than 40 dB in 15-mm thick Gr/epoxy were obtained with generating laser powers well below the ablation limit for the graphite epoxy. Detection was shot-noise limited with a detector noise figure of about 5-10 dB.

Original languageEnglish (US)
Pages (from-to)229-238
Number of pages10
JournalJournal of Nondestructive Evaluation
Volume9
Issue number4
DOIs
StatePublished - Dec 1 1990

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering

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