A-Scan is a testing method that displays ultrasonic echo signals in a waveform format, with the horizontal axis representing the time or depth of sound wave propagation and the vertical axis representing the amplitude of the echo signal. When ultrasonic waves encounter defects (such as delaminations or voids) or interfaces inside a material, reflected signals are generated, appearing as peaks at different positions and amplitudes on the A-Scan waveform. By analyzing the position and amplitude of these peaks, the depth and size of defects can be determined. Additionally, the A-Scan is used to set time gates, selecting signals from specific depth ranges, thereby providing accurate parameter references for subsequent imaging inspections.
