| 陈振华,许倩,卢超.基于超声相控阵衍射波图像的缺陷测量方法*[J].,2018,37(4):447-454 |
| 基于超声相控阵衍射波图像的缺陷测量方法* |
| A defect measurement method based on ultrasonic phased array diffraction wave image |
| 投稿时间：2017-10-29 修订日期：2018-06-26 |
| 中文摘要: |
| 工程应用中通常采用超声相控阵的脉冲发射法对缺陷进行扇形扫描,并通过6dB法测量缺陷尺寸。然而,基于反射波幅度的6dB测长方法很难精确地测量缺陷尺寸。本研究提出利用超声相控扇形扫描图中的缺陷衍射波图像测量缺陷尺寸以获得较高的测量精度。首先,分析了扇扫图像中缺陷衍射波特征图像及其影响参数以获得清晰的扇扫缺陷衍射波图像；其次,提出了基于衍射波的缺陷尺寸测量方法,并比较了多种测量方法的测量精度。研究结果显示：基于相控阵扇扫的缺陷衍射波测长精度较之反射波幅度法更高,而反射波法更适用于缺陷取向的测量。本研究为缺陷定量检测提供了一种更为有效的解决方案。 |
| 英文摘要: |
| In engineering applications, the sector scan of ultrasonic phased array method is used to test the defect, in which the defect size is measured by the 6dB method. However, it is difficult to measure the size of the defect accurately based on the 6dB length measurement method of the reflected wave amplitude. In the study, we proposed to use the defect diffraction wave image in the ultrasonic phased sector scanning image to measure the defect size to obtain higher measurement accuracy. Firstly, the image’s characteristics of diffraction wave and related influence factors are analyzed to achieve higher quality of the image. Secondly, the measurement method of defect size based on diffraction wave is proposed, and the measurement accuracy of various measurement methods is compared. The research results show that the measurement accuracy of the defect diffraction wave of sector scanning is higher than that of the reflected wave amplitude method, and the reflected wave method is more suitable for the measurement of defect’s orientation. The study provides a more effective solution for the quantitative detection of defects. |
| DOI：10.11684/j.issn.1000-310X.2018.04.001 |
| 中文关键词: 超声相控阵,扇形扫描,衍射波,定量检测 |
| 英文关键词: Ultrasonic phased array, Sector scan, Diffraction wave, Quantitative detection |
| 基金项目:(11664027及11374134)及江西省自然科学基金(20161BAB216101) |
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