Cody, o

[MattR]

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Have you resolved your dilemma of visualising the search-flux pattern in Fe mineralized ground?

Back to basics will help. My original little picture was a snapshot of the magnetic consequences. Next one must consider some degree of modification due to the resistance which is also present (or conversely, the conductivity) of the ground.

Whilst Fe provides an easier magnetic path and enhances the flux density, the conductance results in a current flow which in turn reacts with a repulsion to the flux.

Our Teknetics T2's ground phase is the result of these two variables.

[attachment 46610 loopflux6.jpg]​

 

[Cody]

I had the idea that the flux does not penetrate the soil nearly as nice as we are to believe from the PR drawings. Looking at your illustration enforces my thoughts that the flux is more like a yo yo pattern going up and down as we sweep the soil. At times all the factors add up to pretty good penetration and at other times we get very little depth. Poor depth can be from any combination of factors or just from how poorly we maintain the air gap between the coil and soil or if the coil is touching the ground. When we think of ground balance then it seems to me that the depth might resemble something like waves with peaks and valleys. So as we sweep the coil we may well get only three or so inches then go to four or 5 then no more than one or two and so on similar to the old TR. This may be too dramatic of an illustration but gets my point across. Now consider the really deep targets and the flux penetration going from six inches or so down to about nine. If the flux shape is very small at maximum depth and the depth is going up and down then it appears to me that the effective depth for most of us is far less than max most of the time.

That was why I stated something on the lines of I would rather have a consistent flux pattern with penetration that also constant. I have suspected for some time that about six inches is about it for most of us although one in a while we get lucky and hit something deeper.

So my thinking is that perhaps the T2 and F75 have focused on a single frequency, keep the discrimination down, and give the user consistent flux pattern with constant penetration.

How would you like to have a detector that you know is giving you great effectiveness at nine inches virtually all the time?