This paper treats of ultrasonic investigations with air coupling which are part of the German research project MaTech. Subtasks are: development and construction of an ultrasonic imaging system ('Demonstrator III') including special transducers, basic research of transducers, investigations of application to composites, and further developments of the potential of the echo-technique. The demonstrator is under construction and will have the following features: - application of transducers of different manufactures; - fast scanning with a single-shot data acquisition (without signal averaging); - C- scans and full-wave-scans with 12bit resolution; - transmitter with a peak-power of 1.2 kW; - different pulse for excitations: rectangle, burst, chirp- and coded signals; - true Windows. software. Fist investigations showed that : - air-coupled techniques provide a better resolution for sandwich-components than water-coupled ultrasonic techniques; - a low bandwidth can produce lambda/2-resonances in through-transmission technique; - broadband transducers have about a 20 to 30 dB lower sensitivity, which require methods like chirp signals for increasing the signal to noise ratio. Further investigations with free-programmable transmitter signals, signal analysis and multi-element transducers will be carried out for the application of echo-technique.
Inspection of CFRP components by ultrasonic imaging with air coupling
Prüfung von kohlefaserverstärkten Kunststoffkomponenten durch Ultraschallabbildung mit Luftankopplung
2002
8 Seiten, 6 Bilder, 1 Tabelle, 4 Quellen
Conference paper
Storage medium
English
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