Development of a Flexible Laser Ultrasonic Probe

[+] Author and Article Information
Sandra N. Hopko

Exxon, Houston, Texas

I. Charles Ume, Dathan S. Erdahl

School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332

J. Manuf. Sci. Eng 124(2), 351-357 (Apr 29, 2002) (7 pages) doi:10.1115/1.1379369 History: Received December 01, 1998; Revised April 01, 2000; Online April 29, 2002
Copyright © 2002 by ASME
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Laser ultrasonic probe (Hopko and Ume, 1998)3
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Phased array (Hopko and Ume 1998)3
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Optical fiber phased array
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Theoretical beam steering for ablative phased array (longitudinal wave)
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Experimental apparatus for measuring directivity patterns with a phased array
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Pinducer alignment device (side view of half-cylinder specimen)
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Typical wave form (single fiber source ablation @50 deg, 1 mm fiber)
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Longitudinal wave forms at 50 deg for (a) 7-fiber bundle, disk source and (b) 3 source (line) ablative phased array
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Ultrasound directivity (longitudinal wave, single fiber source) for (a) thermoelastic generation and (b) ablation
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Phased array directivity 3 bundled sources. (a) thermoelastic disk sources (ϕ=67 deg), (b) ablation disk sources (ϕ=41 deg) and (c) ablation line sources (ϕ=41 deg)
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Phased array directivity 3 bundled, ablation line sources (ϕ=49 deg)
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Real-time weld monitoring and quality control implementation (Hopko and Ume, 1998),3




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