The Phased array (PA) technique is an advanced technique of ultrasonic testing using multiple element probes and is based on the conventional ultrasonic pulse echo technique.
This technique has the ability to manipulate the sound beam to change the beam angle and/or the focal distance. This is done by varying the timing, the pulsing sequence of the individual elements.
Interference of the sound waves of the individual elements will result in a sound beam at a pre-defined angle. Focusing will optimize the sound beam shape and size at the expected defect location and thus resulting in a higher probability of detection.
Multiple sound beams with different angles can be generated with high speed after each other and can be, after digitization, put together to build a visual image showing a cross-section of the tested object.
Applications
