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Transductores PAUT
The distinguishing feature of phased array ultrasonic testing is the computer-controlled excitation (amplitude and delay) of
individual elements in a multielement probe. Through software, the excitation of multiple piezocomposite elements generates
a focused ultrasonic beam, enabling the dynamic modification of beam parameters such as angle, focal distance, and focal
spot size.
To generate a beam in phase by means of constructive interference, the various active transducer elements are
pulsed at slightly different times. Similarly, the echo from the desired focal point hits the various transducer elements with a
computable time shift. The echoes received by each element are time-shifted before being summed together.
The resulting sum is an A-scan that emphasizes the response from the desired focal point and attenuates echoes from the
other points in the test piece.
