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- W1597954051 abstract "Photothermal - or thermal-wave - imaging is a new technique for the characterization and nondestructive evaluation of materials. This report describes developments in the method, theory, and application of thermal-wave imaging techniques. A theory of multilayer films was developed which showed that both thermal (and for optical sources) optical-boundary-condition reflections contribute to the temperature field within the specimen and, hence, affect the ability of thermal-wave imaging methods to determine the depth (or thickness) of buried flaws (or layers). The analysis made shows that thermal barriers affecting heat flow in a heterogeneous material are of two types, one depending exclusively on thermal properties and the other depending on both thermal and optical properties. Applications of thermal-wave imaging included grain-boundary studies in metals, studies of void location and sizing, and closed-crack visualization using both thermal and thermoelastic methods. Thermal-wave imaging is a pervasive technique for nondestructive evaluation, encompassing a variety of experimental configurations, each supplying different physical information; three different types of processes are effective in creating thermal images; this technique is suitable for studying the microstructure of a variety of materials; thermoelastic mechanisms are operative in thermal-wave imaging; and momentum processes are ineffective in producing thermal images using particle-beam sources. Amore » new thermal-wave imaging technique using an ion beam as the excitation source was developed.« less" @default.
- W1597954051 created "2016-06-24" @default.
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- W1597954051 date "1986-10-01" @default.
- W1597954051 modified "2023-09-23" @default.
- W1597954051 title "Photothermal imaging of defects in metals and ceramics. Final report, 1 September 1983-31 August 1986" @default.
- W1597954051 hasPublicationYear "1986" @default.
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