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Offline willy bayotTopic starter
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« on: December 28, 2009, 10:36:27 am »
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Hi all,

This is the nice results of a series of benchmark tests with the PPM-Markiii made by one of our good clients.
A tunnel has be dug at a depth of 2.7m under a road and a bunch of empty ammunition boxes have been put in the tunnel. Survey grids were then made over this deep target and the results plotted in 2D and 3D.
The rightmost plot is with 4 boxes, next is 7 boxes, next is 11 boxes and the last, leftmost plot has been made with 11 boxes elevated in the tunnel to reduce the depth to around 2m.

Note that an (expensive) EMI sensor device (those so-called 'deep target', two-boxes types of detector) has been used for making surveys in the same conditions and this did not even detect the presence of the last 11 boxes.

Willy

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« Reply #1 on: December 28, 2009, 07:19:10 pm »
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nice piece of equipment you guys made. Can you please
help me with these 2 questions;
 
1 would you be able to get better
resolution if you use more squares in your grid?
or would the result be more or less the same.

2 I know its impossible to see the square boxes
because you measure the mag field right?
thx

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Offline willy bayotTopic starter
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« Reply #2 on: December 30, 2009, 12:10:42 pm »
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1 More square on the grid means narrower grid lines and points giving more resolution on the plot but also longer survey duratrions and the net result would still be equivalent in this particular case. Smaller grid resolution would only be useful to locate very small and shallow targets but this is not the right instrument, you'd better use a standard metal detector in those cases.

2 Boxes can never be actually 'seen'. This is not an X-ray or Ultra-Sound technology, we measure the distortion of the earth magnetic field generated by targets made of magnetic material, that's all. However, it is THE technology which has the highest sensitivity to detect those, responding to the physical rule 'one over third power of distance' while the active electromagnetic systems have a sensitivity which responds to the rule of 'one over the fourth power of distance'.

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Willy


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« Last Edit: December 30, 2009, 12:14:18 pm by willy bayot »
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« Reply #3 on: December 30, 2009, 03:03:40 pm »
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Thx for the reply.

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