Reducing the Noise Level of Reflector Images Using Plane Wave Imaging
Source abstract
Abstract
Reconstruction of the image of reflectors by digital focusing with an antenna array (DFA) has a number of disadvantages such as a large volume of measured echo signals and low energy of ultrasonic waves introduced into the test object (TO). The second circumstance can lead to a small signal-to-noise ratio in test objects with high absorption. The plane wave imaging (PWI) method allows one to combine the advantages of phased array antenna (PAA) technology and DFA technology. In the PWI mode, when a plane wave is emitted, all elements of the antenna array (AA) emit as in the PAA mode; this increases the energy introduced into the TO. To obtain an image, 15 to 20 plane waves are usually used. This leads to a decrease in the volume of measured echo signals, to an increase in the speed of their recording, and to a decrease in the image noise level. Since ultrasonic nondestructive testing often uses AAs mounted on inclined wedges, a PWI version has been developed that takes this into account. Model experiments have shown that the PWI method, in comparison with the DFA method, makes it possible to obtain images of reflectors with a lower noise level in the case of using a wedge for both materials with high absorption and materials with a high level of pattern noise.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Ultrasonics and Acoustic Wave Propagation · Geophysical Methods and Applications · Non-Destructive Testing Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (20)
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