Abstract

Dual matrix transmit-receive longitudinal arrays have been shown to have an improved signal to noise ratio in near field zone which makes them the most suitable array configuration for inspection of near-surface defects. This study aims to compare the performance of different configurations for the transmit-receive longitudinal (TRL) matrix arrays. For this purpose, 4 matrix configurations of 2×32, 4×16, 4×32, and 8×16 elements are investigated using CIVA modeling. The array operating frequencies investigated are either 5 MHz or 10 MHz. The effect of different natural focal depths, arrays' separation distances, dynamic electronic depth focusing, and electronic beam skewing for these TRL arrays are considered in models prepared in CIVA. The inspection of a series of flat bottom holes extended to a few millimeters under the surface using the selected TRL configurations is also investigated in the study. It is found that the focusing for near-surface areas is more efficient using the 4×16 and 8×16 elements configurations as compared to the others and the signal amplitudes of the defects located deeper in the target material are almost independent of the configuration.

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