Laser-ultrasound imaging of defects in carbon fiber composite materials

C. M. Chen; Q. Shan; Richard J. Dewhurst

doi:10.1117/12.250778

18 September 1996 Laser-ultrasound imaging of defects in carbon fiber composite materials

C. M. Chen, Q. Shan, Richard J. Dewhurst

Author Affiliations +

Proceedings Volume 2782, Optical Inspection and Micromeasurements; (1996) https://doi.org/10.1117/12.250778
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

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.

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C. M. Chen, Q. Shan, and Richard J. Dewhurst "Laser-ultrasound imaging of defects in carbon fiber composite materials", Proc. SPIE 2782, Optical Inspection and Micromeasurements, (18 September 1996); https://doi.org/10.1117/12.250778

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