Basic Home Testing

[B^C]

Gday Guy's,

Ray-NM,

The only ferromagnetic materials in the test cell are the soil of course & maybe some very small quantities in componets in the hall detector itself, so maybe this is what is showing.
I don't normally test that much with the hall detector anymore as unfiltered raw figures are much more useful.
Just to add to that it does take time for the magnetic soil paritlces to re align themselves to there original state.


wyndam, wyndam, wyndam, you ask the damndest questions, your not only treading in deep water but there's sharks in there as well haha!

I have tested many ways to get nice target signals, connecting across a target to get a good reading i have found very troublesome indeed.

You have sort of mentioned the Van Der Pauw method which when i first tested using this method thought i was onto something, as it turned out i had nothing but issues due to many & various things & have since found better ways--more on that later.

The Van Der Pauw method of course being a Resistivity Test, which in it's proper application is a good test, unfortunately for Nuggets etc it's not so good compared to some others.

Also any method where you have to form a loop with your connecting wires by connecting probes will have have a measure of induction from the magnetic flux pulse.
This is an issue as slight variations in placement or position of wires will show different readings if good sensitivity is there which is what we want to read these things. With good sensitivity you can actually see very slight induction in a straight piece of wire, which surprised me.

I will Attach some notes on the Van Der Paw method, don't get me wrong you still get readings but not what i consider to be what i am after compared to testing other ways.

I will show some more test results which will answer your other questions better than me writing it out to explain & it will be easier to understand than my dribble..


Tinkerer, if your reading this, sorry i haven't had the time lately to post the things you asked about, i will do, please be patient.

I have found a way to get good Discrimination with a PI Detector on my main circuit that i'm building & have been working nearly 20hrs a day to get it configured into the circuit.
Very excited about this as it is working out nicely.
My wife wants me to sell the whole detector to another manufacturer so they can run with it but my idea is to set things up & just build individual Custom Detectors for people who want better than what ML can supply at cheaper prices. Typical, the wife wants the money in one hit so she can spend it, unfortuantely she wears the pants around here--don't you just Hate that!
Maybe it will work out or i may have my head up my butt as well, time will tell?

[Tinkerer]

Hi B^C,

the thread is very interesting. It is also interesting to see how different people look at a problem in different ways.
With many minds analyzing a problem, it is certain that a solution will be found.

Tinkerer

[wyndham]

Thanks BC, maybe I should go with "No Toes" for a screen name since there be sharks about..
I'm just thinking out loud on this to help me understand what I think I see ; I see a rock dropped into a still pond of water and the ripples going outward from the center and the rebound of the water filling the temporary void creating a resulting column of water, in some ways like the resulting signal from a target but if it were raining in the pond at the time, The rain drop ripples would mask part of the signal from the true target response because of the overlapping noise and the smaller the target the more like noise the target seems to be.
Some people can understand equations but I need to see images instead, just the way I'm wired I guess.
I guess beside the background filter for noisy ground, the question is can a tx signal induce different eddy current responses from different metals or if 2 or more tx signals can be made to suppress one and enhance the other.
Thanks for the thread, best brain food around, Wyndham

[B^C]

Gday Guy's,

Tinkerer, i agree with a solution being found, sometimes though it can be useful to work on specific things but in different area's or in different directons & then add them all together.
I have no doubt that there's thousands of people trying to build the you beaut detector, if only we could incorperate all the individual secrets that people won't talk about into one unit, it would be a good thing.

wyndam,

No Toes she be then, I agree with trying to visualise things, it's easier to understand things then. From your description it is the Temporary Void that i am most interested in, if that makes sense.

---------------------

I thought i would share this & try to get some comments on it, others may have observed the same thing?.
I have like mentioned been trying to get a close look at what exactly happens at the target & i found something that at first i thought was faint noise or something affecting my readings from my Target Cell.

Taking a closer look i found the strangest thing & it appeared to be the faintest signal within a signal if you can believe that, i didn't at first.
On trying to amplify & enhance the signal i was surprised to find an endless type of loop signal, which i called Signal-X?
I worked on this for quite some time trying to amplify it without destroying it & found i could shape this into a figure eight.
Sound like i'm frigin crazy just writting this let alone you reading it, please keep reading & you will see what i am talking about!

Now when i place a Ferrous Target into the target cell it loops out to the left with testing & with a nonferrous target it loops out to the right with testing, i was astonished by this. In saying that it doesn't take much to get me interested in something anyway.

See what you think but to me it appears to show the Eddy Current Impedance Plane & with the Ferrous Target making a more pronounced loop to the left due to the ferromagnetism-Permeability.
Someone with a bit more Nouse than me may find different?

I can invisage that it may be possible to actually get a real visual on a target with this but that's an even wackier story.

The first picture is a very amplified shot of the signal i found.

The second picture is the much worked on figure eight signal.

The third picture is with the Ferrous Target--loop to the Left.

The Fourth picture is the Nonferrous Target--loop to the Right.

[wyndham]

BC could the non ferrous loop be the diamagnetic properties that things like gold or bismuth exhibit. A test on that would be to use a bismuth target to see if the signal is possibly proportional to the diamagnetic of the target .
Wyndham

[B^C]

Gday wyndham,

Ah, yes, i have to be honest & say i completely overlooked the diamagnetic properties when thinking about this, this is indeed a good thought & worth looking into.
The trouble is it now gives me another hundred idea's--oh no! Haha!
Thanks wyndham!