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Laserultraschall-Materialcharakterisierung im Höchsttemperaturbereich

High-temperature material characterization by laser ultrasonics
: Paul, M.; Haberer, B.; Hoffmann, A.

Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin:
Die ZfP der DACH-Länder im Spiegelbild internationaler Normung. Band 1
1996 (DGZfP-Berichtsbände 52,1)
ISBN: 3-931381-07-0
Jahrestagung Zerstörungsfreie Materialprüfung <1996, Lindau>
Fraunhofer IZFP ()
ceramic; high-temperature; Hochtemperatur; Keramik; Laserultraschall; Materialcharakterisierung; materials characterization; metal; Metall

The paper describes an experimental method for ultrasonic material characterization at temperatures up to 2000 Kelvin. As ultrasonic source a pulsed laser is used exciting different ultrasonic moeds. Especially the precursor propagating with longitudinal velocity is characterized by its high bandwidth. As ultrasonic receiver an optical heterodyne interferometer is used detecting normal surface displacements. Apart from ultrasonic velocity measurements the method is ideally suitable for the measurement of ultrasonic absorption applying the reverberation technique. The measurements are performed by heating up the sample in a furnace, exciting ultrasonic signals at the surface and picking-up these signals at the opposite side. In the paper measurements at cast iron and SiC are presented and discussed.