Concrete crack depth detection based on array ultrasonic imaging method
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摘要: 针对传统超声法检测混凝土裂缝深度时人为影响因素较多，检测效率十分低下的问题，引入了阵列超声成像法，研究了阵列超声成像法检测裂缝深度的原理及其计算方法，并在实验室设计制作了一块预设7条不同深度裂缝的素混凝土试件，进行了跨单裂缝和试件整体成像检测试验。试验结果表明：阵列超声成像法根据缝底反射超声波的传播时间来检测裂缝深度，生成的二维图像可以显示缝底位置，但无法显示缝身；该检测法的检测精度较高，并且随着裂缝深度的加深逐渐提高；检测时应考虑边界效应，否则无法准确检测裂缝深度；检测时存在盲区，当缝底位于盲区内时会出现漏检。Abstract: As there are many artificial factors influencing the evaluation of depth of concrete cracks detected by traditional ultrasonic method, the detection efficiency is therefore very low. In this paper, array ultrasonic imaging method is introduced to study the detection principle and calculation principle of crack depth detection by array ultrasonic imaging method. In addition, a concrete specimen with seven cracks of different depths is designed and produced in the laboratory, and the test of cross-single crack and overall image detection of specimen is carried out. The test results show that:the array ultrasonic imaging method detects the crack depth according to the propagation time of ultrasonic reflected from the seam bottom, and the generated 2D image can display the position of the seam bottom, but not the seam body. The detection accuracy is high and is gradually improved with the deepening of crack depth. Boundary effect should be considered in the detection, otherwise the crack depth cannot be accurately detected. There is a blind area in the detection, and some undetected cracks may exist when the seam bottom is in the blind area.
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