Defect Recognition of Ultrasonic Testing Signals Based on Multi-Frame Correlation

Correlation is a useful method to describe the similarity between signals in time domain. Based on digital correlation, a new method of multi-frame correlation is introduced to process large amount of inspection signals and complete defect recognition in the experiment of ultrasonic testing, and in this process, the multi-frame correlation method not only eliminates the random disturbing signals, but also acquires a high correct rate beyond 90% of defect recognition.