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Publication - Professor Robert Smith

    Row-column Addressed Arrays for Non-Destructive Evaluation Applications


    Kirkpatrick, J, Wilcox, P & Smith, R, 2019, ‘Row-column Addressed Arrays for Non-Destructive Evaluation Applications’. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control.


    Row-column Addressed (RCA) arrays are 2-d arrays formed by two orthogonal overlapping linear arrays made up of elongated elements. This substantially reduces the number of elements in the 2-d array. Modelled data are used to compare RCA arrays in pulse-echo mode to fully populated 2-d arrays for Non-destructive Evaluation (NDE) applications and an improved beamforming algorithm based on the total focusing method is tested. Improved beamforming has led to a less than half-wavelength diameter conical bottom hole being successfully detected experimentally using an RCA array, with a maximum signal-to-noise ratio of 17.0dB (3.s.f). The average difference between the -6dB drop width and the nominal drill bit diameter when sizing flat bottom holes experimentally using RCA arrays is also improved compared to plane B-scan algorithms from (1.29±0.07)mm to (0.23±0.04)mm. These developments demonstrate the advantages of using RCA arrays over conventional fully populated 2-d arrays and provides a basis for their use, and development, in the field of NDE.

    Full details in the University publications repository