LASER-BASED NON-DESTRUCTIVE TESTING TECHNIQUES FOR THE ULTRASONIC CHARACTERIZATION OF SUBSURFACE FLAWS

Laser generation and detection of ultrasound has been used for remote characterization of flat-bottomed holes, acting as sub-surface flaws, drilled into an aluminium test sample. A pulsed Nd: YAG laser system was used to generate the ultrasonic source whilst a He-Ne laser interferometer detected the subsequent surface displacements. The technique allows both the width and depth of flaws to be assessed. Moreover, an analysis of the data shows that the method is particularly suited to detection of flaws' up to 4 mm below the surface of the sample, a region which is difficult to inspect by conventional contact ultrasonic techniques.

• Supplemental Notes:
  • NDT International,17, (1984), p.329 (Dec.) (7 pp., 13 ref., 1 tab., 2 diag., 5 graphs)
• Authors:
  • Aindow A M
  • Dewhurst R J
• Publication Date: 1984

Language

• English

Subject/Index Terms

• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00687848
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM