Jian Shen , Liu Liu , Zhenming Shi , Shaojun Li , Ming Peng , Yao Wang , Chunsheng Liu
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引用次数: 0
Abstract
Fast detection of the depths of surface-open cracks plays an important role in evaluating the damage conditions of concrete elements. The presence of surface-open cracks and other anomalies inside concrete complicates the ultrasonic wave field and thus severely undermines the precision of traditional nondestructive testing methods. This study introduces independently developed low-frequency ultrasonic array detection equipment. The detector adopts a doubled-ray coverage strategy to enhance the imaging stability under noisy conditions. Moreover, we propose an imaging method called the crack focusing-synthetic aperture focusing technique (CF-SAFT), through which both reflected and transmitted surface waves are removed so that only diffracted SH waves converge to their origins. An extra instantaneous phase analysis is supplemented to highlight the diffraction points. We test the effectiveness of our method through a multitude of numerical examples and a model experiment. Successful depth identification was obtained regardless of different geometries of the cracks or interference from the steel reinforcements. The superiority of our method is further verified through noisy ultrasonic data and complex scenarios.
在评估混凝土构件的损坏情况时,快速检测表面开裂深度起着重要作用。混凝土内部存在的表面开裂和其他异常现象使超声波场变得复杂,从而严重影响了传统无损检测方法的精度。本研究介绍了自主研发的低频超声阵列检测设备。探测器采用双射线覆盖策略,提高了噪声条件下的成像稳定性。此外,我们还提出了一种名为 "裂纹聚焦-合成孔径聚焦技术(CF-SAFT)"的成像方法,通过这种方法,反射波和透射表面波都被去除,从而只有衍射 SH 波汇聚到其源头。此外还辅以瞬时相位分析,以突出衍射点。我们通过大量的数值示例和模型试验来检验我们方法的有效性。无论裂缝的几何形状如何,也无论钢筋的干扰如何,我们都成功地识别了裂缝的深度。通过噪声超声波数据和复杂场景,我们进一步验证了我们方法的优越性。
期刊介绍:
The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.