Abstract
Ultrasonic phased arrays are currently very popular in medical diagnostics and are used more and more for non-destructive evaluation (NDE) of different materials. NDE methods using phased arrays are used to analyse material properties, to measure wall thickness, to detect hidden cracks and other defects affecting structural integrity. Ultrasonic phased arrays can be used for the detection of different types of defects at different depths. In many cases depth of the critical zone, where defects can appear, is known, so the signal of the phased array has to be focused at this depth. In some cases immersion methods are preferred. In this paper the algorithm for the calculation of the time delays of the phased array probe, when the beam has to be focused at the required focal depth in the test object, after passing through the water layer (in the case of the immersion testing), is presented. The time delays of the phased array probe where calculated using developed algorithm in MATLAB. The verification of the algorithm was performed using CIVA software – the focused ultrasonic fields at the given depth in the second media were calculated using the time delays, calculated using developed algorithm. DOI: http://dx.doi.org/10.5755/j01.eee.20.3.3638
Highlights
Already for some time ultrasonic phased arrays are widely used for medical diagnostics [1]–[3]: they are used for gynaecology, obstetrics, encephalogy, ophthalmology, cardiology and etc
The objective of the simulation was to calculate the ultrasonic field of the phased array probe focused at a given distance in the case of the immersion testing
The calculated time delays were used in CIVA [16] for modelling of the ultrasonic field transmitted by a phased array probe
Summary
Already for some time ultrasonic phased arrays are widely used for medical diagnostics [1]–[3]: they are used for gynaecology, obstetrics, encephalogy, ophthalmology, cardiology and etc. Nowadays the ultrasonic phased arrays are used more and more for non-destructive evaluation (NDE) of different materials as well [4]–[8]. Different applications apply different ultrasonic beam patterns - phased arrays can implement many different inspection techniques [9]–[11]. The typical ultrasonic phased array system includes phased array probe, electronics for beam steering, acquisition and imaging modules. These systems allow highspeed electronic manipulation of the beam: phased arrays can scan, sweep, steer and focus the ultrasonic beam. The algorithm for the calculation of the time delays of the linear phased array probe is presented, when the beam has to be focused at the specified depth in the test object, inspected using the immersion testing
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