In contrast to a conventional UT manually scanned probes that emit fixed direction beam, the beam from a phased array probe can be moved electronically, without moving the probe, and can be swept through a wide volume of material at high speed. The beam is controllable because a phased array probe is made up of multiple small elements, each of which can be pulsed individually at a computer calculated timing.
The PA probe consists of many small ultrasonic transducers, each of which can be pulsed independently. By varying the timing, for instance by pulsing the elements one by one in sequence along a row, a pattern of constructive interference is set up that the results in a beam at a set angle. In other words, the beam can be steered electronically.
Application of PA
PA is widely used in several industrial sectors, such as construction, power stations, petrochemical, oil and gas, foundry, etc. The following application can be performed with PA:
- Inspection of Welds
- Thickness measurements
- Corrosion inspection
- Flaw detection
Advantages of PA
Due to the possibility to control parameters such as beam angle and focal distance, this method is very efficient regarding the defect detection and speed of testing.
We perform the test in accordance with ASTM E2700: Standard Practice for Contact Ultrasonic Testing of Welds Using Phased Arrays