| 赵国旗*,虞波,骆英,王自平.与CRP相结合的SAFT在混凝土损伤检测成像中的研究[J].实验力学,2015,30(6):717~722 |
| 与CRP相结合的SAFT在混凝土损伤检测成像中的研究 |
| On the Imaging Method in Concrete Damage Detection Based on the Combination of SAFT with CRP Signal Superposition Method |
| 投稿时间：2015-04-14 修订日期：2015-06-03 |
| DOI：10.7520/1001-4888-15-056 |
| 中文关键词: 混凝土损伤定位 合成孔径聚焦技术(SAFT) 共反射点(CRP) 超声成像 |
| 英文关键词:concrete damage location synthetic aperture focusing technique (SAFT) common reflection point (CRP) ultrasound imaging |
| 基金项目:国家自然科学基金项目(No.11272138, No.11402101),高等学校博士学科点专项科研基金优先发展领域课题(No. 20123227130002) |
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| 中文摘要: |
| 将传统合成孔径聚焦技术(Synthetic aperture focusing technique, SAFT)与共反射点(Common reflection point, CRP)信号叠加法相结合应用于混凝土损伤检测中,可提高在强噪声环境中拾取缺陷回波信号的能力。本文采用二维有限元仿真验证了该思想的合理性,通过混凝土实验检验了该方法在实际应用中的可行性和有效性。与传统SAFT成像结果相比,应用CRP信号叠加法的SAFT提高了成像横向分辨率和损伤定位精度,为工程应用提供了理论和实验参考。 |
| 英文摘要: |
| Traditional synthetic aperture focusing technique (SAFT) uses single transducer to excite and receive signal. So the received signal usually has low signal-to-noise ratio. In concrete damage detection, the combination of traditional SAFT with common reflection point (CRP) signal superposition method can enhance the ability of extracting defect echo signal in a strong noise environment, and then improve the signal-to-noise ratio. The rationality of this idea was validated by two-dimensional finite element simulation. The feasibility and validity of this method in practical application were examined by concrete experiment. Comparison between the traditional SAFT detect imaging and SAFT detect imaging combined with CRP signal superposition method indicates that latter enhances imaging lateral resolution and accuracy of damage location and then may provide theoretical and experimental reference for engineering application. |
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