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Proceedings Paper

Laser-ultrasound imaging of defects in carbon fiber composite materials
Author(s): C. M. Chen; Q. Shan; Richard J. Dewhurst
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Paper Abstract

C-scan images are presented of artificial defects in carbon fiber composite materials derived from a laser ultrasound imaging system. Detection of ultrasound has been achieved from natural material surfaces, by an actively stabilized Fabry-Perot interferometer in conjunction with an argon-ion laser source. Recent measurements have been made in what is known as the thermoelastic regime, so that the sample did not suffer surface damage from any plasma spark. However, signals were averaged in order to produce good quality images. These were further processed using a separable median filter to give images which compared favorably with X-ray radiography measurements. Using 0.25 mm pixel separation in the scanning process, images with size resolution better than 0.5 mm were achieved.

Paper Details

Date Published: 18 September 1996
PDF: 10 pages
Proc. SPIE 2782, Optical Inspection and Micromeasurements, (18 September 1996); doi: 10.1117/12.250778
Show Author Affiliations
C. M. Chen, Univ. of Manchester Institute of Science and Technology (United Kingdom)
Q. Shan, Univ. of Manchester Institute of Science and Technology (United Kingdom)
Richard J. Dewhurst, Univ. of Manchester Institute of Science and Technology (United Kingdom)


Published in SPIE Proceedings Vol. 2782:
Optical Inspection and Micromeasurements
Christophe Gorecki, Editor(s)

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