Examination of materials with the mobile thermal microscope ALADIN,a new analytical tool of materials technology |
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| Authors: | Volker Thien Peter Vetterlein Michael Kröning Erich Winschuh |
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| Institution: | (1) Division of Materials Engineering and Research, Siemens AG, Group Power Generation KWU, P. O. Box 10 17 55, D-4330 Mülheim/Ruhr, Federal Republic of Germany |
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| Abstract: | Frequency-modulated optical beams—preferentially laser beams—can excite temperature-modulated thermal waves in a material; their properties are described. Photothermal methods can be used to determine properties of materials at and/or below the surface. The working principle of the thermal microscope ALADIN (advancedlaser-aideddefectinspection innon-destructive testing) is explained; this instrument (developed by Siemens/KWU in collaboration with Phototherm Dr. Petry GmbH/Saarbrücken) provides the user with a flexible, high performance system of modular design. The most important features are mobility, compact design of the sensor and its suitability for use under extremely ambient conditions, e.g. field metallography in power plants. The equipment allows scanning of an area up to 25 mm2 with a lateral resolution in the micrometer range. Some examples are given; one of the main applications will be the determination of fatigue or creep damages at metal surfaces.Dedicated to Professor Günther Tölg on the occasion of his 60th birthday |
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| Keywords: | properties of thermal waves photothermal effect laser-aided thermal microscope properties at and below materials surfaces mobile device field metallography creep fatigue |
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