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Date Posted: 13:07:11 04/12/02 Fri
Author: Ralph
Subject: Re: One quick thought......
In reply to: Steve Herschbach 's message, "Re: One quick thought......" on 10:52:36 04/12/02 Fri

Hi Steve,

I noticed your link to Eric's forum. Some great stuff circulating over there, as always.

As most PI technology stands right now, it is primarily centered on "detection" with little advancement in the way of "discrimination" over the years. PI is a much simpler technology than IB, but with many more "possibilities" as microprocessor technology advances. Since IB can effectively use relative conductivity to discriminate between one type of metal and another (or ferrous vs. non) it is easier to work with IB on discriminating machines. Pulse induction is still in it's "infancy" alright, even though it is an older technology where hobby metal detectors are concerned. But since so much concentration has been place on IB over the years, PI has lagged as you mention. Still, PI works with so much more "potential" information that it will eventually make today's detectors look like sharpened sticks from the stone age. Right now PI is still taking it's first steps as far as microprocessor technology, but once it gets it's feet..... look out ! It's just a matter of "initiative" in getting this technology up to speed and enough interest by the right people to make it happen.

How the IB works does make the collected information easier to interpret (for discrimination) as you say. But "multi-frequency" IB detectors have nothing on PI types, as a PI may work over a range of several dozens or hundreds of definable frequency points within the spectrum, giving it the full potential of any IB machine currently produced and MUCH more. It's just a matter of the technology to interpret all of the information available, and the processing capabilities to capture the "right" information on a consistent basis.

Minelab's "niche" is in gold detectors where PI is concerned, but even so, there are areas where PI is the ONLY answer to many mineralization problems. With Minelab's PI units, they have really made no significant crossroads in the "basic" technology except in the realms of ground cancelling. Remember that ALL PI detectors are known for their depth capabilities in excess of most IB types. Even Minelab's so-called "discrimination" is anything but consistent or accurate on their PIs. The "right combination" of circuitry design for a good discriminating PI simply hasn't been reached as of yet.

And speaking of MPS or multi-period or multi-pulse sensing, that is another misconception on the part of many, and is not actually Minelab's brainchild. MPS was under design and in use long prior to Minelab's claims.

Just a few thoughts.....

Ralph

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