42 Field procedure
of measure points will be used for all further scanning paths of this measurement. Starting from the second
scanning path, the device now stops automatically after the assumed number of impulses has been reached.
Keep in mind the number of impulses which you have recorded per scanning path. This amount
should be entered later in the software program, when transferring the data to a PC, to receive
all measured data correctly from your measuring instrument!
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 is, the more exactly the graphical representation will be. 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 8.3 shows the effects of the distance and the number of impulses per scanning path for some objects.
Figure 8.4 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.
OKM GmbH
www.okmdetectors.com
Figure 8.4: Comparison of low and high number of impulses
Figure 8.3: Effects of changing the number of impulses and their distance
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