Investigation on the Method of Suppress Noise in the Laser-EMAT Testing Based on Adaptive Filter Technology

Introduces the adaptive filter technique based on the least mean square algorithm. The proposed method is applicable to the noise suppression during the detection process of the laser-EMAT technique. Experiments have been carried out on the 6016 aluminum plate, and the ultrasonic signal of surface defect has been processed by LMS adaptive digital filter designed by MATLAB. The results show that the technique can improve the identification ability of defect signal. The technique has good prospects in the engineering applications of laser-EMAT testing.