Abstract
Currently, phased arrays have found wide application in ultrasonic nondestructive testing. Volumetric results provided by the inspections with linear phased arrays have low lateral resolution in the elevation direction of such probes. This fact complicates the defects characterization task. In this paper, we suggest the application of the Phase-Reversal Fresnel Zone Plate to increase the resolution of volumetric imaging with linear phased arrays. Application of such plates is aimed at ultrasonic focusing in the elevation plane whereas focusing on the active aperture plane is provided by the application of the Sampling Phased Array. Furthermore, the use of the Phase-Reversal Fresnel Zone Plate is advantageous due to the capability of its 3D printing and introduction to the existing automated testing systems avoiding making changes to the current software and hardware. The effectiveness of the plates was verified experimentally on the existing automated testing system. The obtained experimental results demonstrate that the application of the Phase-Reversal Fresnel Zone Plate allowed achieving the results of the higher resolution as well as improving the signal to noise ratio.
Highlights
In recent years, phased arrays (PA) have found wide applications in ultrasonic nondestructive testing
In order to compare the results and find out if the PR-Fresnel Zone Plate (FZP) is capable of improving the lateral resolution in elevation plane, two-dimensional projections of volumetric imagery are required
The Phase-Reversal FZP (PR-FZP) application for improvement of the resolution of linear PA inspections was considered. The utilization of such a lens is aimed at focusing on the elevation plane whereas focusing on the active aperture plane is obtained via the PA operation mode
Summary
In recent years, phased arrays (PA) have found wide applications in ultrasonic nondestructive testing. The advantages of such probes over the single element transducers are the ability to perform multiple inspections, provide higher sensitivity and results in the form of the imagery of the internal structure of testing objects [1]. In automated testing systems with linear PA, 3D imagery are commonly obtained via the combination of 2D slices of the volume of interest. Such slices are obtained from the coherent summation of the imagery determined in each position of the PA during its motion along the active aperture of the PA (Figure 1)
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