26. February 2024 © Copyright 2024, PROCEQ SA 16
Figure 8: Description of total A-scan recorded per cycle – dual configuration.
Why do we record only 28 A-scans instead of 8x8=64 A-scans?
The A-scan obtained by channel i in transmission and channel j in reception is under some
broad assumption equal to the A-scan obtained by channel j in transmission and channel i in
reception. In other words, swapping the transmitter and the receiver leads to the same result.
To reduce the amount of data processed and transmitted between the Pundit and the iPad,
the redundant data is ignored.
Also, the pulse echo signals are not acquired because they have a poor signal-to-noise ratio:
immediately after transmission, the transducer rings (dead zone), making it unable to record
correctly.
For these reasons, only 28 A-scans are kept.
What's the advantage of using two Pundits together (16 channels)?
When using two Pundits connected together, the 16 channels lead to 15*16/2=120 signals, as
shown in the table above, 28 signals come solely from the first device (purple), 28 from the
second device (blue), the remaining 64 signals come from both the first and second devices.
A single acquisition with a 16-channel Pundit leads therefore to more than 4 times the amount
of data compared to a single acquisition with an 8-channel Pundit. This does not mean that the
image is 4 times "better", but the improvement remains significant.
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