透性缺陷的超声波阵列成像,以基于主导响应减去的对比增强为基础
Long Bai1, Changrong Guo1, Tao Ye1
1State Key Laboratory of Intelligent Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Ultrasonics
|July 29, 2023
概括
这项研究引入了一种新的超声波阵列成像方法,以改善工程结构中的缺陷检测. 该技术提高了"死区"的图像质量,使得可以更好地识别毛孔缺陷.
科学领域:
- 材料科学 材料科学 材料科学
- 非破坏性测试 不破坏性测试
- 超声波成像 超声波成像
背景情况:
- 孔隙缺陷对工程结构的检查构成了挑战.
- 超声波非破坏性测试 (NDT) 对于材料完整性评估至关重要.
- 在"死区"中的图像质量通常会因表面毛孔的掩盖效应而降低.
研究的目的:
- 增强超声波阵列成像,以更好地检测和定位毛孔缺陷.
- 为了克服超声波无核试验中"死区"的局限性.
- 开发一种方法,在表面有孔隙的情况下提高图像质量.
主要方法:
- 使用卷积稀疏编码从最上端的孔隙中提取主导的散射贡献.
- 实施单一的散射模型,以准确地提取孔隙贡献.
- 从图像形成之前的数组数据中减去提取的孔径贡献.
主要成果:
- 成功地提高了"死区"的图像质量,以检测孔隙缺陷.
- 在毛孔定位方面取得了高精度,平均误差在0.27mm (0.14λ) 之内.
- 对测量噪声和不同成像参数的成像方法的证明稳定性.
结论:
- 拟议的超声波阵列成像方法有效地解决了在NDT中的"死区"问题.
- 该技术有助于可靠地检测和定位毛孔缺陷.
- 对噪声和参数效应的分析提供了实施的实际指导方针.
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