A single magnetic marker pin that is close to the surface can
appear to have multiple peaks as the M-Scan is traversed
across it.
In Figure 8 there are two smaller, but detectable, side lobes (A)
either side of a central main peak (C) when using the M-Scan
vertically to find a magnetised marker pin. Note there is a null
either side of the centre (B) where the lines of magnetic flux
are at right angles to the sensor tube.
Figure 8
Peaks and nulls when
traversing a marker pin.
Application Note 5. Finding the Centre of a Target
19
Summary of Contents for M-SCAN
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