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Date Posted: 16:21:39 08/22/02 Thu
Author: Reg
Subject: Re: Thanks Jim, but...
In reply to: Jim Straight 's message, "Re: Infinium Hype" on 12:42:51 08/22/02 Thu

I really don't fall in the same league as George Payne or Dave Johnson. Actually, I do not come even close to your knowledge of the ground mineralization and its composition. I do appreciate the compliment though.

Your synopsis of ground conditions is right on the money. Great post.

It is strange that you should mention the ground mineralization and my knowedge of it. I just emailed George Payne with a question about that very issue. The issue has to do with something I have seen on various forums where people are trying to relate ground conditions to VDI numbers.

Yes, I have done' a lot of studying and experimenting of ground conditions as they relate to metal detectors. Yes, I have done a lot of research in this area, but over the years I have relied very heavily for answers about VLF detectors on one design engineer. That person is George Payne. His knowledge is phenomenal. I feel I am very fortunate that he will share his knowledge with me.
Actually, now I really need to add Eric Foster to that list also. Eric has been a great help and has provided tremendous information about PI's over the last year. Because of Eric and some help from George, coupled with my year's worth of experimenting and designing, I feel quite comfortable discussing PIs now.

Getting back to the Infinium or rather PI's in general since they all basically work the same, PI's operate totally differently from a VLF. As such, one shouldn't expect to be able to relate much of anything between the two types of detectors. Example, there is no relationship between operating frequencies between the two types of detectors. The principles of operation are totally different. Ground balance is done totally different, as is discrimination, or as it is called, reverse discrimination on a PI.

Probably the best analogy I can think of to show the strking difference between the two is comparing cars to planes. Both cars and planes are a means of transportation but certainly go about it in different fashions. In the case of PI's and VLF's, they are both metal detectors but they certainly use different concepts.

In the case of the PI and its discrimination capabilities, there are two techniques that can be used. I am not sure if the Infinium is using one or both. One aspect has to have a DD coil to work. The other does not.

The common term, reverse discrimination, basically works on the principle that signals from lower conductive objects die out quicker so if a sample is taken later in time, a lower conductive target signal will have already died out and no response will be heard. This technique does not require a DD coil and is the most common form of disc on a PI.

The problem with this concept is both gold and iron objects are not consistent. Example, I have some 1/2 oz nuggets that will not give any indication at maximum delay (later sample time), but have a 1/4 oz nugget that will. On the other side of the coin, thicker iron objects will usually produce a nice strong signal at maximum delay but thin metals like old cans may die out just like a nugget.

Well, I have taken up too much space with this post already.

Reg

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