Chinese Optics Letters, 2013, 11 (s2): S21103, Published Online: Aug. 22, 2013
Hybrid laser-EMAT system for non-destructive testing continuous casting billet Download: 1043次
110.5125 Photoacoustics 170.1065 Acousto-optics 220.4840 Testing 070.1060 Acousto-optical signal processing
Abstract
A novel laser-electro magnetic acoustic transducer (EMAT) system for nondestructive testing NDT surface crack of continuous casting billet (CCB) is provided. Rayleigh wave generated by line laser source is used to detect the surface crack of CCB. According to the principle of mode conversion from Rayleigh wave to shear wave, the defect signal is received using the shear wave EMAT sensor in a non-contact way. Experiments are carried out on the steel sample with size 30 × 0.2 × 0.2 (mm) of crack. Further, the influences of life off value and distance between EMAT sensor and laser beam on the testing sensitivity are discussed, respectively. It is found that the life off value is the main factor that effects sensitivity of the proposed method. There is a clear prospect of the method applied to test continuously cast bloom at high temperature.
Yang Zhao, Shuai Liu, Rui Guo, Jian Ma, Jiangfeng Song, Jihua Sun, Zhongqing Jia. Hybrid laser-EMAT system for non-destructive testing continuous casting billet[J]. Chinese Optics Letters, 2013, 11(s2): S21103.