C-scan experimental analysis of flexible Koch fractal eddy current sensor
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摘要:
利用柔性科赫分形涡流传感器与传统柔性圆形分形涡流传感器,基于C扫描方式对金属表面裂纹的覆盖面进行了检测。试验结果表明,使用C扫描方法,可以对长度不小于3 mm的裂纹进行有效识别。其中,与传统柔性圆形分形涡流传感器相比较,柔性科赫分形涡流传感器所检测的信号衰减程度较小,不易出现漏检现象,且在检测微小裂纹时表现得尤为明显。
Abstract:In this paper, the coverage area of metal surface cracks was detected based on C-scan mode by using flexible Koch fractal eddy current sensor and traditional flexible circular parting eddy current sensor. The experimental results showed that cracks with a length greater than or equal to 3 mm can be effectively identified by C-scan. Among them, compared with the traditional flexible circular fractal eddy current sensor, the signal attenuation detected by the flexible Koch type eddy current sensor was small, and the phenomenon of missed detection was not easy to occur, and the detection of small cracks was particularly obvious.
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Table 1 试块中的被测裂纹参数
裂纹序号 长度/mm 宽度/mm 深度/mm 方向/（°） 1~7 5 0.15 0.2~1.4（步长0.2） 90 8~14 5 2.0,1.8,1.5,1.0,0.5,0.3,0.1 1 90 15~21 3 0.15 1 0~90（步长15） 22~28 20,15,10,5,3,1,0.5 0.15 1 90 
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