脈沖渦流陣列成像技術研究.pdf

1、南京航空航天大學碩士學位論文脈沖渦流陣列成像技術研究姓名：孫海龍申請學位級別：碩士專業(yè)：測試計量技術及儀器指導教師：王海濤2011-02南京航空航天大學碩士學位論文 V Abstract Pulsed eddy current technology is the rapid development of a non-destructive testing technology in recent years, and it can be

2、 used to detect metal surface and subsurface crack quickly. In the field of non-destructive testing the application of imaging technology can be used to get the location of defects and the size of defects intuitively, wh

3、ich not only improve the efficiency of testing staff but also greatly contribute to the popularity of non-destructive testing technology. With sensor array technology, this paper realizes the pulsed eddy current array pr

4、obes to the defect of standard aluminum specimen scanning image processing. First this paper introduces the application background and development status at home and abroad of the pulsed eddy current testing technology,

5、and uses the the simulation software of COMSOL to design the 4 4 × array probe based on the theoretical analysis. In order to achieve the array probesimaging detection of defects on the cross, we designed a pulsed e

6、ddy current hardware test platform, which consists of signal modules, array probe, test specimen, signal conditioning modules and data acquisition modules. The detecting signal is processed by low-pass filter and the mea

7、n filter, and the signal eigenvalue of imaging is extracted. In the part of defect imaging we use Matlab software and BP neural network to identify the defect signal and achieve the pulsed eddy current array probe for de

8、tection of defects in static imaging, and on this basis, we have successfully used LabVIEW software to achieve dynamic imaging on the cross-shaped defects. Finally, the conclusion of this paper is given and some suggesti