Correction Factors; Figure 4-4 Probe Element Marks On The Wedge - Olympus FlexoFORM User Manual

3. On the OmniScan, press the Play key (
4. Make your scan motion, and observe the instrument display to make sure that all
data has been captured.
5. After completing the first scan, press the indexing button.
6. Slide the scanner over, align it on the next scan zero position, and align the
element 1 mark on the wedge with the element 64 mark on the pipe.
7. Make your next mark at element 64, and then press the indexing button again and
wait at least one second after having pressed the button before moving (to avoid
the risk of overwriting your data).
8. Repeat the above steps 4–7 until you complete all necessary inspection scans.
4.3

Correction Factors

The probe's concave shape, its distance away from the inspection surface, and the
number of elements in its beam affect the effective probe beam width and observed
defect size in the following ways:
• The effective width covered by the probe beam on the inspection surface is
smaller than the width of the probe's active aperture.
• The length of a defect (along the index axis) appears to be longer than it is in
reality.
• As the inspection surface radius (pipe diameter) decreases, the above effects
increase in magnitude.
To compensate for these effects, correction factors need to be applied.

Figure 4-4 Probe element marks on the wedge

10-003591-01EN [Q7780031], Rev. 4, January 2020
64 1
) to set the encoder position to zero.
Inspection 41