Wave and Beam
The beam is a result of the wave travelling in the part.
- The pulser/receiver is fired, sending a square wave to the element. The element expands, producing an ultrasound wave. The wave expands, generating the beam
- Although the beam is always represented as a whole, in reality, the beam is created by the wave front, so only the part of the beam crossed by the wave front is active
- It is the fast repetition of the same wave front that simulates a whole beam
Ultrasound waves are travelling at several thousand meters per second. Hence, it is possible to reproduce the same wave front so fast, that, to the human eye, it looks like the inspection is done with a solid beam.