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Proceedings Paper

Evaluation of sonic IR for NDE at Lawrence Livermore National Laboratory
Author(s): Wayne O. Miller
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Paper Abstract

Sonic IR was evaluated as an NDE technique at LLNL using a commercial ThermoSoniX system from Indigo Systems Corp. The main effort was to detect small cracks in aluminum oxide, a dense stiff ceramic. Test coupons were made containing 0.2- mm cracks by surface grinding, 1-mm cracks by compression with a Vickers bit, and 4-mm cracks by 3-point bending. Only the 3-point bend cracks produced thermal images. Several parts shattered during testing, perhaps by being forced at resonance by the 20-kHz acoustic probe. Tests on damaged carbon composite coupons produced thermal images that were in excellent agreement with ultrasonic inspection. The composite results also showed some dependence on contact location of the acoustic probe, and on the method of support. Tests on glass with surface damage produced weak images at the pits. Tests on metal ballistic targets produced thermal images at the impact sites. Modal analyses suggest that the input frequency should be matched to the desired response, and also that forced resonance damaged some parts.

Paper Details

Date Published: 23 March 2001
PDF: 12 pages
Proc. SPIE 4360, Thermosense XXIII, (23 March 2001); doi: 10.1117/12.420978
Show Author Affiliations
Wayne O. Miller, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 4360:
Thermosense XXIII
Andres E. Rozlosnik; Ralph B. Dinwiddie, Editor(s)

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