What is the difference between time of flight diffraction and phased array?
I am giving you an Answer but still not sure if this is right
!
Phased array system:
Phased array system consists of many elements which are pulsed
sequentially at different time intervals and hence this avoiding
the usage of different angle Probes.In Phased array system the the
64 channels are integrated in a single casing hence only one probe
is used.
In TOFD system is mainly designed to overcome the difficulties
and complications faced in the Radiographic testing.In TOFD system
there are different channels with a separate Transmitter and
Receiver.The number of channels is directly Propotional to the
thickness and hence more the number of channels,more thickness the
waves can travel.