Abstract
<p class="1Body">We suggest using sets of pseudo-orthogonal code with antenna arrays working in Full Matrix Capture (FMC) mode, to increase the rate of data acquisition. This allows the use of signals comprised of phase-manipulated Kasami sequences, specifically developed for CMDA technology. The use of the Maximum Entropy Method (MEM) for decoding signals in lieu of matched filtration allows us to reduce noise level and increase time resolution in reflectors’ image. Additionally, to reduce noise level by more than 6 dB we suggest the use of various Kasami sequences for each position of an antenna array. Numerical and model experiments demonstrate the efficacy of the proposed approach.</p>
Highlights
Antenna rays are widely used in ultrasonic flaw detectors to visualize the internal structure of the targeted object: such as – most commonly – the internal technology of phased arrays (PA) (Olympus NDT., 2007), and the technology used by digital focus antenna (DFA) (Voronkov et al, 2011; Bazulin, Vopilkin, & Tikhonov, 2015). Bazulin (2013), which is dedicated to the comparison of PA and DFA, we conclude that DFA technology is more promising, we consider it in more detail
We suggest using sets of pseudo-orthogonal code with antenna arrays working in Full Matrix Capture (FMC) mode, to increase the rate of data acquisition
Image reconstruction is undertaken with the use of the combined SAFT method (C-SAFT) (Kovalev et al, 1990), which can be modified to account for multi-path ultrasonic testing of object with uneven borders (Bazulin, 2015)
Summary
Antenna rays are widely used in ultrasonic flaw detectors to visualize the internal structure of the targeted object: such as – most commonly – the internal technology of phased arrays (PA) (Olympus NDT., 2007), and the technology used by digital focus antenna (DFA) (Voronkov et al, 2011; Bazulin, Vopilkin, & Tikhonov, 2015). Bazulin (2013), which is dedicated to the comparison of PA and DFA, we conclude that DFA technology is more promising, we consider it in more detail. Image reconstruction is undertaken with the use of the combined SAFT method (C-SAFT) (Kovalev et al, 1990), which can be modified to account for multi-path ultrasonic testing of object with uneven borders (Bazulin, 2015) This method is called the Total Focusing Method (TFM) (Chatillon, Fidahoussen, & Calmon, 2009). By increasing the number of antenna array elements Ne data size increases quadratically This leads to a decrease in the acquisition rate, as the transmission of echoes from the measuring unit to the image processing computer can be time consuming. The tasks of increasing the speed and reducing the acquired data size are highly relevant for more efficient ultrasonic inspection
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