The meaning of A scan for an ultrasonic thickness gauge.
The usual "reading type thickness gauge" only displays the thickness reading, but does not display the bottom wave signal of the measured part. This is fine for flat surfaces or uniform materials.
However, in the case of R angles, thin parts, or coarse crystals, the bottom wave signal is not stable, and the instrument may read it wrong. At this time, it is necessary to use the "A-scan display" to show where the real bottom is, so as to adjust, grab, and read the real thickness value.
A-scan is the core function of high-end ultrasonic thickness gauges. It realizes thickness measurement by analyzing the echo time difference. Its intuitiveness makes it widely used in industrial inspection, but it needs to be combined with material sound velocity calibration and operation skills to ensure accuracy.
Principle meaning: Time domain waveform diagram, A-scan display is the waveform of the amplitude (signal strength) received by the ultrasonic probe changing with time. It is mainly used for thickness measurement and defect information inspection.
