Abstract

Along with such advantages as high resolution over the entire area of reflector image reconstruction and the ability to produce images taking into account the reflection from and transformation of wave type at the boundaries of a test object, reconstruction of reflector images by the digital antenna focusing (DFA) method has several disadvantages, including a large volume of measured echo signals, long image reconstruction time, and an insufficiently high energy of ultrasonic waves introduced into the test object. Plane wave imaging (PWI) combines the benefits of phased antenna array (PAA) and DFA technologies. In the PWI mode, all elements of the antenna array (AA) operate when a plane wave is emitted (as in the PAA mode), which makes it possible to increase the energy introduced into the test object, and echo signals are recorded by all elements of the AA (as in the DFA mode). Reflector images are reconstructed by the SAFT method. To produce an image, one can use the number of emitted plane waves less than the number of elements in the antenna array, thus decreasing the volume of measured echoes. Transferring calculations into the domain of spatial sectors allows improving the performance of reconstructing the images of reflectors. Model experiments have shown the positive and negative aspects of producing the images of reflectors by the PWI method compared to the DFA technique both with and without a wedge.

中文翻译：

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平面波成像技术在超声无损检测中的应用

摘要

除了反射面图像重建整个区域的高分辨率以及考虑到测试对象边界处波型的反射和变换来生成图像的能力外，还具有通过数字天线聚焦重建反射面图像的能力（ DFA)方法有几个缺点，包括测量回波信号量大，图像重建时间长，以及引入到测试对象的超声波能量不够高。平面波成像 (PWI) 结合了相控天线阵列 (PAA) 和 DFA 技术的优点。在 PWI 模式下，天线阵列 (AA) 的所有元件在发射平面波时工作（如在 PAA 模式下），这可以增加引入测试对象的能量，和回波信号由 AA 的所有元素记录（如在 DFA 模式中）。反射器图像通过 SAFT 方法重建。为了生成图像，可以使用比天线阵列中元素数量少的发射平面波的数量，从而减少测量回波的体积。将计算转移到空间扇区的域中可以提高重建反射器图像的性能。模型实验表明，与使用和不使用楔块的 DFA 技术相比，通过 PWI 方法生成反射器图像的积极和消极方面。从而减少测量回波的音量。将计算转移到空间扇区的域中可以提高重建反射器图像的性能。模型实验表明，与使用和不使用楔块的 DFA 技术相比，通过 PWI 方法生成反射器图像的积极和消极方面。从而减少测量回波的音量。将计算转移到空间扇区的域中可以提高重建反射器图像的性能。模型实验表明，与使用和不使用楔块的 DFA 技术相比，通过 PWI 方法生成反射器图像的积极和消极方面。