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Saft applied to anisotropic and attenuative materials using sparse array data and signal processing

: Spies, M.; Rieder, H.


Thompson, D.O.:
Review of Progress in Quantitative Nondestructive Evaluation. 26A : Portland, Oregon, 30 July - 4 August 2006; the 33rd Annual Review of Progress in Quantitative Evaluation
Woodbury, N.Y.: AIP, 2007 (AIP Conference Proceedings 894)
ISBN: 978-0-7354-0399-4
ISBN: 0-7354-0399-6
S.806- 813
Annual Review of Progress in Quantitative Nondestructive Evaluation <33, 2006, Portland/Or.>
Fraunhofer IZFP ()
defect; reconstruction; array; ultrasonic

Improved SAFT imaging methodologies are discussed for the inspection of composite materials and coarse-grained polycrystalline materials. The problem of unfavourable beam fields of conventional transducers, which occurs for specific elastic material properties, is solved by using a two-dimensional array for beam focusing and steering. Additionally, redundant sets of rf-data are acquired and used for image reconstruction by exciting the transmit and receive elements, respectively, in variable subsets, revealing the promising potential of sparse array applications.