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Pi detector for big, deep gold nuggets?
Hi forum members,
Without anyone giving away any secrets I would like to know some of the design and circuit criteria for building a Pi platform optimized for detecting large( 1 ounce and over ) gold nuggets over highly magnetic soils with perhaps 20-30% more depth than existing Pi platforms. I know we will need big coils but what configuration? DD, monoloop or coplanar or other configurations? We will need longer pulse lengths, a lower transmit frequency? (1000 Hz or lower?) to maximize skin depth. But what about duty cycles, sample delays, sampling windows, power supplies, bipolar or unipolar square wave pulses etc. Will it be easier on such a platform to eliminate or minimize the effects of ground ferrites?
Could the Hammerhead Pi platform be optimized to achieve this?
Why I ask all these questions is because there is a niche but significant marker in Australia for such a detector that is not being satisfied by any of the current manufactures. Minelab in my opinion have made little progress in this area as the 3500 has about the same (or even less!) depth capability on big nuggets as the SD 2000 of 1995! All prospectors in Oz know that there are big nuggets that are just beyond the reach of our present detectors. A 20-30% potential increase in depth capability on big nuggets would have a dramatic impact in Oz as many of the larger nuggets have been found 3”-6” above the basement. It is highly likely in some of these places that there are very large undiscovered nuggets on basement frustratingly just out of reach of our present technology.
I would appreciate your thoughts.
OpAmp82
Hi forum members,
Without anyone giving away any secrets I would like to know some of the design and circuit criteria for building a Pi platform optimized for detecting large( 1 ounce and over ) gold nuggets over highly magnetic soils with perhaps 20-30% more depth than existing Pi platforms. I know we will need big coils but what configuration? DD, monoloop or coplanar or other configurations? We will need longer pulse lengths, a lower transmit frequency? (1000 Hz or lower?) to maximize skin depth. But what about duty cycles, sample delays, sampling windows, power supplies, bipolar or unipolar square wave pulses etc. Will it be easier on such a platform to eliminate or minimize the effects of ground ferrites?
Could the Hammerhead Pi platform be optimized to achieve this?
Why I ask all these questions is because there is a niche but significant marker in Australia for such a detector that is not being satisfied by any of the current manufactures. Minelab in my opinion have made little progress in this area as the 3500 has about the same (or even less!) depth capability on big nuggets as the SD 2000 of 1995! All prospectors in Oz know that there are big nuggets that are just beyond the reach of our present detectors. A 20-30% potential increase in depth capability on big nuggets would have a dramatic impact in Oz as many of the larger nuggets have been found 3”-6” above the basement. It is highly likely in some of these places that there are very large undiscovered nuggets on basement frustratingly just out of reach of our present technology.
I would appreciate your thoughts.
OpAmp82