Phased Array principle
The principle of phased array technology is to activatefor
each shot all or some of the transducer elements which, with the
adapted delay laws, contribute collectively to the generation of
Electronic Commutation (multiplexor):
beam is electronnaly translated by alternatively firing a given
number of elemnts of a linear or circula phased array transducer.
This technique is an alternative to the mechanical translation of
a single element probe.
- Faster inspection
- No mechanical movement required, or reduction of scanline number
- Possibility of combining with electronic focusing and beam steering
The beam is electronically focused by applying symmetrical
delay laws to the different elements of a linear or annular phased
This technique is an alternative to using several transducers to
focusat different depths.
- Only one probe for focusing at each depth
- Thanks to dynamic focusing the inspection of thick pieces can
be make faster.
- Electronic focusing can compensate for focusing aberrations
due to refraction at interfaces.
beam is electronicaly deflected by applying delay laws to different
elements of a linear, circular or matrix array. Linear and circular
arrays allow for 2D beam steering, while matrix arrays allow for
This technique is an alternative to using several transducers at
- Only one transducer is required for inspection at variable angles
- Faster inspection of parts with complex geometry
- This technique can be combined with electronic focusing
Illustration of wave propagation
All the elements of the transducer
are activated for each slot, with or without delay low, to insonify
a whole cut of the inspected part, or to concentrate the energy
in a selected area.
Reception also takes place using all
the elements of the transducer. An advanced treatment in thenundertaken
electronically to build an image of the part in the incidence plane
of the transducer.
This technique has the advantage of
being very fast, as it requires only one ultrasonic shot to inspect
a cut, whereas cenventionnal phased array technology requires linear,
circular or angular scanning, each requiring ultrasoni shots.