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Proceedings Paper

Acoustic thermography using an uncooled high-speed camera and low-power ultrasonic excitation: test system and its application to impact flaw detection in CFRP
Author(s): Lothar Haupt; Manfred Zimmerhackl; Norbert Meyendorf; Bernd Köhler
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Paper Abstract

Acoustic thermography is a relatively new NDE method based on thermographic detection of dissipated ultrasonic energy. The system presented uses an uncooled high-speed camera and low power ultrasonic excitation. This technology is characterized by low system costs, since no nitrogen or stirling cooling is necessary. Low power applications are facilitated by efficient ultrasonic coupling, hence taking care of sensitive objects. A camera has been developed which uses a 384 x 288 pixels micro-bolometer array as sensor and may record up to 100 frames per second. The advantages of this system are demonstrated on a set of carbon fiber reinforced plastic (CFRP) plates damaged by impacts of various strengths. The impact flaws consisting of fiber fractures and delaminations can be detected while transmitting low ultrasonic energy of only about 1.3 W to the specimen.

Paper Details

Date Published: 16 March 2006
PDF: 9 pages
Proc. SPIE 6179, Advanced Sensor Technologies for Nondestructive Evaluation and Structural Health Monitoring II, 617903 (16 March 2006); doi: 10.1117/12.660766
Show Author Affiliations
Lothar Haupt, Fraunhofer Institute for Non-Destructive Testing (Germany)
Manfred Zimmerhackl, DIAS Infrared GmbH (Germany)
Norbert Meyendorf, Fraunhofer Institute for Non-Destructive Testing (Germany)
Bernd Köhler, Fraunhofer Institute for Non-Destructive Testing (Germany)


Published in SPIE Proceedings Vol. 6179:
Advanced Sensor Technologies for Nondestructive Evaluation and Structural Health Monitoring II
Norbert Meyendorf; George Y. Baaklini; Bernd Michel, Editor(s)

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