26. February 2024 © Copyright 2024, PROCEQ SA 14
1st transmission: channel 1 (1st column of transducers) transmits, channels 2 to 8
(included) receive and record each an A-scan (7 A-scans recorded),
2nd transmission: channel 2 transmits, the channels 3 to 8 receive and record each an
A-scan (6 A-scans recorded),
...
7th transmission: channel 7 transmits, channel 8 receives (1 A-scan recorded).
Total: 28 A-scans are recorded (7+6+5+4+3+2+1=7*8/2=28) per acquisition cycle. The table
below illustrates this.
Figure 6: Description of total A-scan recorded per cycle.
This acquisition scheme is a variation of the so-called "Half Matrix Capture" (ultrasonic testing
terminology), except that the pulse-echo signals (same channel used in transmission and
reception) are not acquired.
In short, a complete cycle consists of 28 individual A-scans. These are used to create a B-
scan which is displayed in real time on the measurement screen. This is extremely useful for
carrying out quick spot checks at any point of the structure without the need to save any data.
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