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Inspection of CFRP Components by Ultrasonic Imaging with Air Coupling

Hillger, Wolfgang and Meier, R. and Henrich, R. (2004) Inspection of CFRP Components by Ultrasonic Imaging with Air Coupling. Insight, 46 (3), pp. 147-150.

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Abstract

This paper reports the investigations of air coupled ultrasonic imaging techniques which are part of the German research project MaTech. Project partners are Airbus, Bremen, Ingenieurbüro Dr. Hillger, Braunschweig, and intelligeNDT, Erlangen, with DLR, Braunschweig, as subcontractor. One task is the development and the construction of a non-contact ultrasonic imaging system („Demonstrator III“) for basic researches. This system provides fast scanning with a single-shot data acquisition (without signal averaging). The dynamic range in one shot reaches up to 50 dB. The demonstrator allows the application of different types of air coupled transducers and therefore it allows the comparison of their performances. The modular design of the system provides further developments and adaptations to special inspection tasks. A power transmitter with burst-signals ( peak power of 1.2 kW) and a free programmable transmitter can be used for the excitation of the transducers. The user-friendly software records C-scans and full wave scans and provides C-scan evaluations. The development and construction of special transducers for air coupling and the development of a system for echo-technique are further research tasks of the MaTech project. Usually, the air coupled ultrasound is used in through-transmission technique with separate receiver and transmitter transducers on opposite sides of the component under test. In order to get a high acoustic power and a low noise in the receiver amplifier usually the bandwidth of the system is smaller than 10% of the centre (test) frequency. Therefore, the effects of (*/2)-resonances in the components are investigated. Also the application of broadband transducers will be investigated.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:Inspection of CFRP Components by Ultrasonic Imaging with Air Coupling
Authors:
AuthorsInstitution or Email of Authors
Hillger, WolfgangUNSPECIFIED
Meier, R.UNSPECIFIED
Henrich, R.UNSPECIFIED
Date:2004
Journal or Publication Title:Insight
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:46
Page Range:pp. 147-150
Status:Published
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Institut für Strukturmechanik
Deposited By: Sibylle Wolff
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:33

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