What does a cathode-ray tube (CRT) display in ultrasonic testing?

In ultrasonic testing, a cathode-ray tube (CRT) display is utilized to visualize the amplified electrical signals that result from the interaction of ultrasonic waves with the material being tested. During the testing process, ultrasonic waves are transmitted into the material, and as these waves encounter flaws or boundaries, they are reflected back. The received echoes are converted into electrical signals, which are then amplified for better visualization.

The CRT serves to display these signals, typically in the form of waveforms or traces that represent the amplitude and time of the received echoes. By analyzing the patterns shown on the CRT, technicians can assess the integrity of the material, identify flaws, and determine material thickness. This makes the amplified electrical signals from ultrasonic testing the primary information displayed on the CRT, essential for interpreting the results effectively.