Применение технологии Plane Wave Imaging в ультразвуковом неразрушающем контроле

Abstract

Image recovery of reflectors by digital antenna focusing (DFA), along with such advantages as high resolution over the entire image recovery area of reflectors, the ability to obtain images taking into account the reflection and transformation of the wave type from the boundaries of the object of control, has several disadvantages: a large volume of measured echo signals, a long image recovery time and insufficient energy of ultrasonic waves introduced into the object of control. The Plane Wave Imaging (PWI) method allows you to combine the advantages of phased array antenna technology (PHAR) and CFA technology. In the PWI mode, when a plane wave is emitted, all elements of the antenna array (AP) work, as in the FAR mode, which allows you to increase the energy introduced into the control object, and echo signals are recorded by all elements of the AP, as in the CFA mode. The image of the reflectors is restored by the raman SAFT method. To obtain an image, you can use the number of radiated plane waves less than the number of elements of the antenna array, which reduces the volume of measured echo signals. Translation of calculations to the area of spatial sectors allows you to increase the speed of recovery of the presentation of reflectors. Model experiments have shown the positive and negative aspects of obtaining images of reflectors by the PWI method in comparison with the CFA method, both for the case of using a prism and without a prism.