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6. Acoustic Recommendations
This chapter presents the acoustic recommendations to follow when making
inspections using the WheelProbe 2. It provides information about settings,
calibration, and data extraction for both Veoand Prisma test instruments.
6.1 Interface Triggering (Zero Synchronization)
The interface triggering is used to modify the reception of ultrasound signals. When
set to Yes, the IFT Active parameter enables the part interface triggering for this
scan. It is available for the following types of scans:
∗ A-scan (mono)
∗ L-scan (phased array)
Once enabled, a new gate (white, named "I") is made available in the A-scan view.
Interface triggering is used to synchronize signal interface when it varies from one
beam to another.
This corrects the distance between the probe and the part when the wedge does not
have a fixed height. This feature overcomes delay variations due to the tyre
deformation.
To set the interface triggering:
1 On the test instrument, press the MENU key.
2 Select the Scan tab and, on the Scan menu, select Rx.
3 In the list of RX parameters, select Yes for IFT active.
white dot
In the A-scan, the white dot appearing on the first peak indicates where the 0-mm
part starts.
NOTE: The height of the wedge determines where the raw acquisition begins. Reduce the
wedge height if you do not see the interface echo.
NOTE: The range of the interface gate defines the time duration of the search for the part
interface.
SOFRANEL
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