THERMAL WAVE IMAGING OF DEFECTS IN OPAQUE SOLIDS.

D. N. Rose, D. C. Bryk, D. J. Thomas, R. L. Thomas, L. D. Favro, P. K. Kuo, L. J. Ingelhart, M. J. Lin, K. O. Legg

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Thermal wave imaging of defects in opaque solids is carried out by focusing the periodically modulated intensity of a heat source (conventionally a laser, electron beam, or ion beam) at the surface of the solid. Solution of the heat equation shows that the ac temperature in the solid is wave-like (thermal waves), and critically damped. These waves can be used to probe the thermal properties of the subsurface of the solid, and their reflections from discontinuities in thermal impedance can be used to image subsurface defects such as inclusions, voids, cracks, and delaminations. Various techniques have been developed to detect the resulting ac temperature variations at the sample surface, including photoacoustic (gas-cell) detection, thermoacoustic (piezoelectric transducer) detection, optical probe beams, and ac infrared detection. Thermal wave imaging is particularly useful to probe subsurfaces from depths of about 1 micron to 300 microns, with a maximum depth of about 2 mm.

Original languageEnglish
Title of host publicationSagamore Army Materials Research Conference Proceedings
EditorsJames W. McCauley, Volker Weiss
PublisherPlenum Press
Pages547-564
Number of pages18
ISBN (Print)0306420953
Publication statusPublished - 1986 Dec 1

Publication series

NameSagamore Army Materials Research Conference Proceedings
ISSN (Print)0080-5335

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Rose, D. N., Bryk, D. C., Thomas, D. J., Thomas, R. L., Favro, L. D., Kuo, P. K., Ingelhart, L. J., Lin, M. J., & Legg, K. O. (1986). THERMAL WAVE IMAGING OF DEFECTS IN OPAQUE SOLIDS. In J. W. McCauley, & V. Weiss (Eds.), Sagamore Army Materials Research Conference Proceedings (pp. 547-564). (Sagamore Army Materials Research Conference Proceedings). Plenum Press.