| 熊政辉,陈俊超,荆砚,何喜,陈尧.应用于斜楔块的子孔径虚拟源全聚焦成像*[J].,2024,43(3):625-634 |
| 应用于斜楔块的子孔径虚拟源全聚焦成像* |
| Sub-aperture Virtual Source Total Focus Method applied to oblique wedges |
| 投稿时间：2022-11-29 修订日期：2024-05-06 |
| 中文摘要: |
| 楔块斜入射检测工艺下，楔块会进一步降低全聚焦(Total Focus Method, TFM)成像的缺陷检测能力。尤其是在检测大深度缺陷和粗晶材料时，全聚焦图像会因为缺陷回波幅值下降，导致缺陷图像的信噪比较低。为了提高入射能量，本文提出了应用于斜楔块的子孔径虚拟源全聚焦(Sub-aperture Virtual Source Total Focus Method, SVS-TFM)成像技术。研究结果表明：该技术通过延时控制子孔径阵元激励形成虚拟源发射，显著增加了射入到被检构件中的声能。在横向Q值为20mm~40mm探头移动区间内，17mm~38mm深度范围内Φ3边钻孔幅值较黄铜全聚焦图像提高4.58 dB~7.12 dB；当钢制试块为被检对象时，在横向Q值为30mm~40mm探头移动区间内，40mm~65mm深度范围内Φ1边钻孔幅值较全聚焦图像提高0.63 dB~2.35 dB。 |
| 英文摘要: |
| Under the wedge oblique incidence detection process, the use of wedges will further reduce the defect detection capability of Total Focus Method (TFM). Especially in the detection of large depth defects and coarse-grained material, the TFM image will have a low signal-to-noise rate due to the decrease in the amplitude of defect feedback. In order to improve the incident energy, a Sub-aperture Virtual Source Total Focus Method (SVS-TFM) is proposed for oblique wedge imaging. The results show that this technique can control the sub-aperture element excitation by time delay to form a virtual source emission, which significantly increases the acoustic energy emitted into the detected component. When the transverse Q value is 20mm~40mm, the amplitude of Φ3 side drilling in the depth range of 17mm~38mm is 4.58dB~7.12dB higher than that in the brass full-focusing image. When the transverse Q value is 30mm~40mm, in the depth range of 40mm~65mm, the amplitude of Φ1 side drilling is 0.63 dB~2.35 dB higher than that of carbon steel TFM image. |
| DOI：10.11684/j.issn.1000-310X.2024.03.019 |
| 中文关键词: 子孔径虚拟源；相控阵；全聚焦；超声；斜楔块 |
| 英文关键词: Sub-aperture virtual source Phased array Total focusing method Ultrasonic testing Inclined wedge |
| 基金项目:国家自然科学基金(62161028, 12064001, 51705232)项目,南昌航空大学研究生创新专项资金项目 (YC2022-s741) |
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