Abstract:
Weld seam detection has been a key detection object in industrial nondestructive testing, but there is still no dynamic detection method which is reliable and accurate, the acoustic source localization is an important aspect to achieve dynamic detection for weld seam with acoustic emission (AE). A 2D time reversal imaging method for acoustic source is proposed. According to the characteristics of AE, time reversal process is derived by combining with the time reversal theory, which could effectively improve the SNR; In the light of the four point arc imaging method, the characteristics of the two imaging modes are analyzed; Finally, the localization method is validated through numerical simulation, and the simulation results show that the time reversal imaging method can accurately locate the position of the acoustic source, and the two imaging ways have some difference, but imaging results are consistent and there are no influence on the positioning accuracy after threshold processing.