Blending of phased array data
conference paper
The use of phased arrays is growing in the non-destructive testing industry and the trend is towards large 2D arrays, but due to limitations, it is currently not possible to record the signals from all elements, resulting in aliased data. In the past, we have presented a data interpolation scheme 'beyond spatial aliasing' to overcome this aliasing. In this paper, we present a different approach: blending and deblending of data. On the hardware side, groups of receivers are blended (grouped) in only a few transmit/recording channels. This allows for transmission and recording with all elements, in a shorter acquisition time and with less channels. On the data processing side, this blended data is deblended (separated) by transforming it to a different domain and applying an iterative filtering and thresholding. Two different filtering methods are compared: f-k filtering and wavefield extrapolation filtering. The deblending and filtering methods are demonstrated on simulated experimental data. The wavefield extrapolation filtering proves to outperform f-k filtering. The wavefield extrapolation method can deal with groups of up to 24 receivers, in a phased array of 48 × 48 elements.
TNO Identifier
788766
ISSN
0094243X
ISBN
9780735416444
Publisher
American Institute of Physics AIP
Article nr.
080005
Source title
44th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2017, 16-21 July 2017
Editor(s)
Chimenti, D.E.
Bond, L.J.
Bond, L.J.
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