QANTITATIVE DETECTION METHOD OF MICRO-DEFECTS THROUGH LOW-FREQUENCY ULTRASONIC MULTI-RESOLUTION SCANNING IMAGING
개요
발명자
Zhiyuan MA; Li LIN
IPC 분류
CPC 분류
In a quantitative detection method of micro-defects through low-frequency ultrasonic multi-resolution scanning imaging, the collected ultrasonic A-type scanning signals are decomposed through split spectrum processing into sub-signals with different center frequencies f, amplitude imaging is performed on the same sub-signals f, a defect size ddetected by a half of the amplitude of the image is identified, linear fitting is performed on dwith faccording to the sound field directivity function, and dcorresponding to the slope k=−0.01 of the fitting curve is the quantitative size of the defect.
원문 (중국어)
In a quantitative detection method of micro-defects through low-frequency ultrasonic multi-resolution scanning imaging, the collected ultrasonic A-type scanning signals are decomposed through split spectrum processing into sub-signals with different center frequencies f, amplitude imaging is performed on the same sub-signals f, a defect size ddetected by a half of the amplitude of the image is identified, linear fitting is performed on dwith faccording to the sound field directivity function, and dcorresponding to the slope k=−0.01 of the fitting curve is the quantitative size of the defect.