A Novel Laser-EMAT System for Noncontact Testing Metal Materials

Abstract:

Detection and characterization of defects in metal parts in industrial and commercial settings has typically been carried out by nondestructive ultrasonic inspection systems. The aim of present work is to propose a kind of non-contact nondestructive testing system based on the laser and electro-magnetic acoustic transducer (EMAT) techniques, which is suitable to inspect the defects in metal material. The maximum lift-off value (LOV) of the system is 10 mm. Wavelet threshold method (WTM) is employed to improve the signal to noise ratio (SNR), and the values of SNR increase to 67.42 dB and 64.66 dB for the case of LOV=0 mm and LOV=10 mm, respectively.

• Periodical: Applied Mechanics and Materials (Volume 281)
• Pages: 422-425
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.281.422
• Online since: January 2013
• Authors: Yang Zhao, Zhong Qing Jia, Guo Rui, Jian Ma, Jiang Feng Song, Ji Hua Sun, Shuai Liu
• Keywords: EMAT, Laser Ultrasonic, Nondestructive Testing (NDT), Wavelet

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