idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
Fraunhofer IZFP offers its customers and research partners the entire range of nondestructive testing technologies, whether it involves basic or applied research. The institute's researchers, engineers and technicians develop solutions to address modern testing applications including feasibility studies, consulting, training and inspection services and creating prototype systems. From June 13 to 17, 2016, Fraunhofer IZFP will present recent applications of SAFT including beam field simulation for curved components at the World Conference on Non-Destructive Testing (WCNDT) in Munich.
One of the prominent tasks of nondestructive testing and evaluation is the detection and characterization of defects in materials and components. For ultrasonic inspection a variety of techniques such as single probe, tandem or pitch-and-catch as well as phased-array techniques are available. Reliable defect detection requires defined and reproducible, i.e. mechanized scanning of the probes along the surface of the components. From the recorded ultrasonic rf-data, amplitude and time-of-flight information can be extracted and used for the assessment of a defect. However, such an evaluation is likely to provide insufficient quantitative results in cases of complex defect geometries and/or unfavourable material properties.
The Synthetic Aperture Focusing Technique (SAFT) has – not only for such complex applications – been successfully applied to improve the performance of ultrasonic testing. The algorithmic processing of the raw rf-data leads to a reduction of the microstructural noise signals and thus to an improvement of the signal-to-noise ratio of the defect echoes. In our contribution we will present recent developments and applications of SAFT with reference to components with curved surfaces. We report on the proper consideration of the transducer beam fields via simulation to enhance the SAFT reconstruction capabilities. We will show several illustrative on- and off-site inspection scenarios e.g. for pipes and fittings where defect detection has been addressed using conventional ultrasonic probes as well as electromagnetic acoustic transducers.
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