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Material characterization by contactless measurement of ultrasonic absorption using laser ultrasound

Materialcharakterisierung durch berührungslose Messung der Ultraschallabsorption mittels Laserultraschall

: Haberer, B.; Paul, M.; Willems, H.; Arnold, W.

	Green, R.E.; Kozaczek, K.; Ruud, C.: Nondestructive characterization of materials VI New York/N.Y.: Plenum Press, 1994 pp.317-324
	International Symposium on Nondestructive Characterization of Materials <6, 1993, Oahu>

	English
	Conference Paper
	Fraunhofer IZFP ()
	aluminium; cast iron; Gußeisen; innere Reibung; internal friction; laser ultrasonics; Laserultraschall; logarithmic decrement; Nachhall-Methode; relaxation; reverberation method; Stahl; steel; ultrasonic absorption

Abstract
A new method is presented for contact free measurement of ultrasonic absorption in polycrystalline materials.Short laser pulses are used for the generation of ultrasonic pulses, and an optical interferometer for the detection of the reverberation of these pulses in the whole specimen. Measurements on aluminium, steel, and white cast iron are presented.

: http://publica.fraunhofer.de/documents/PX-22899.html