Steel Plate Surface Inspection Based on Interference Enhancement of Rayleigh Waves Generated by EMAT
-
摘要: 电磁超声检测在具有非接触优势的同时，存在换能效率低、信号噪声大的不足。利用电磁超声无需耦合剂对声波传播无干扰的特点，研究了基于声波干涉增强的钢板表面缺陷超声检测方法。在制作了一种用于扫查检测的电磁超声表面波传感器的基础上，搭建了相应的试验平台，对钢板表面人工刻槽进行了检测。试验结果表明：当传感器与刻槽满足一定的位置关系时，超声信号将增强10%~20%。利用此现象进行缺陷评判，可避免分析相对较弱的缺陷回波，为电磁超声检测技术的应用提供了一种新方法。Abstract: Electromagnetic acoustic testing has been widely used in many industrial fields due to its non-contact characteristic, while it’s still restricted by the low efficiency and large signal noise. This paper studies a different ultrasonic method for steel plate surface inspection based on interference enhancement of Rayleigh waves. An electromagnetic acoustic transducer(EMAT) is used to generate the Rayleigh wave because of its advantage of no couplant interference with the acoustic wave propagation. With the self-developed EMAT that can be used for scanning inspection, a platform is set up to conduct the experiment of slots testing. Results show that the ultrasonic signal enhances 10%~20% when the transducer is placed in certain location from slots and this provides the possibility of using the enhancement to evaluate defects without analyzing the relatively weak defect reflections.
-
Keywords:
- EMAT /
- Rayleigh wave /
- Interference enhancement /
- Steel plate /
- Slot
-
-
[1] 张勇，陈强，孙振国，等.用于无损检测的电磁超声换能器研究进展［J］.无损检测,2004,26(6):275-279. [2] 王淑娟，康磊，赵再新，等.电磁超声换能器的研究进展综述［J］.仪表技术与传感器,2006,(5):47-50. [3] SOHN Y, KRISHNASWAMY S. Mass spring lattice modeling of the scanning laser source technique［J］. Ultrasonics,2002,39:543-551. [4] BOONSANG S, DEWHURST R J. Enhancement of laser-ultrasound/electromagnetic-acoustic transducer signals from rayleigh wave interaction at surface features［J］. Applied Physics Letters,2003,82(19):3348-3350. [5] ARIAS I, ACHENBACH J D. A model for ultrasonic detection of surface-breaking crack by the scanning laser source technique［J］. Wave Motion,2004,39:61-75. [6] EDWARDS R S, DIXON S, JIAN X. Enhancement of the rayleigh wave signal at surface defects［D］. Journal of Physics D: Applied Physics,2004,37(16):3391-2297. [7] THOMPSON R B. Physical principles of measurements with EMAT transducers［J］. Physical Acoustics,1990,19:157-200. [8] 巴洪.钢板电磁超声检测方法的实验研究［D］.武汉：华中科技大学,2013.
计量
- 文章访问数: 2
- HTML全文浏览量: 0
- PDF下载量: 4
下载:
