Field procedure 75
There is no special rule for selecting the right number of impulses. But there are different aspects which
should be considered. These are some considerations
• the length of your measured area and
• the size of the objects you are searching for.
A preferable distance between two impulses is about 15 cm to 30 cm. The smaller the distance between
two impulses, the higher the precision of the graphical representation. If you are looking for small
objects you have to select a smaller distance, for big objects you can increase the distance between the
impulses.
Figure 7.3 shows the effects of the distance and the number of impulses per scanning path for some
objects.
Figure 7.4 shows the difference between very few impulses (left side) and much more impulses (right
side) on the same length of scanning path. Therefor the second record (right side) shows much more
details and also smaller objects can be seen.
Do not hesitate to record more measurements with different numbers of impulses. For example you can
scan a large area before doing a second detailed precision measurement. Especially if searching for
bigger objects you can proceed like this. With this manner you can measure a larger area very quickly
and afterward you make new scans localizing the suspect targets.
OKM GmbH
www.okmmetaldetectors.com
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