Polar Plot

[Rob (IL)]

Here's a few shots of the polar plot. Sorry about the focus. Straight is good curved is bad.
This is what junk looks like.
[attachment 158752 Junk.jpg]

Here's a wheatie.
[attachment 158753 Wheatie.jpg]

Here's a Quarter.
[attachment 158754 quarter.jpg]

 

[Butch in Colorado]

Thanks for the photos. If I had my doubts about a purchase (which I don't), I would not have anymore now. I can see this mode being used a lot for detecting for everyone that gets the i. Now there will be no questions as whether to dig or not to dig.

My b-day is coming up and I'm getting a new, really cool present in the V3i.

 

[Butch in Colorado]

Rob,

Can you take a picture of a polar plot detecting a gold ring? I'd like to see how that looks if possible?
Thanks.

 

[ak_1234]

Happy Birthday!

One caveat for the polar plot of course - the deeper the target, the more ground has an effect on the signal which will affect the curve on the polar plot. (Same as with all information on the detector - it's still not a magic wand for the deeper targets).

 

[Butch in Colorado]

My guess would be that, once properly tuned, targets at depths up to 6in. this mode will be accurate enough to provide a reliable plot. Yes? No?

 

[ak_1234]

Depending on ground conditions, I think that sounds about right.

 

[Rob (IL)]

It's just a tool. It won't show the difference (IMHO) between a tab and a ring. The best tool is still the one between your ears. Can it tell a nickel from a penny from a dime from a quarter, yes. Do you need this no. For me if it showed a target was bad it was bad (junk). Could I tell jewelry from junk, I couldn't, but then I couldn't with the analysis screen.

 

[Neil in West Jersey]

I left town on a business trip for a few days so I have been out of the loop on these developments with the V. What do the vertical & horizontal points mean? Is it a ferrous/conductive scale similar to those on the Minelab units? Sorry if this has already been answered.

 

[Rob (IL)]

OK, Butch here is a picture of a size 7 gold ring I found on my hunt with Larry.
[attachment 158760 ring2.jpg]

Here is the plot.
[attachment 158761 ring.jpg]

Here is a nickel.
[attachment 158762 nickel.jpg]

 

[Butch in Colorado]

But what it will do is provide a characteristic difference between what is good and what is not good. That is where the polar display will prove its worth.
That is the point I am making here. The characteristic of a good target has a distinct display difference from the characteristic of a bad target. Your photos demonstrate this.

Is it going to tell me exactly what it is? No, no detector does this. Will it tell me I have a good target verses a crappy target, exactly no, but it will provide me with additional information that I did not have before. It, along with the graphs, along with the software between my ears will be the final determination. But it has provided me with an additional method if analyzation that I did not have before.

That's a good thing, yes?

 

[Butch in Colorado]

n/t

 

[Butch in Colorado]

Both good signal plots. Now show a pulltab in that same vdi range and my guess is that it will look like a lissajous pattern with multiple harmonic frequencies on the x and y axis (it will look like a rats nets). An indication as to not to dig as also exhibited in one of your photos.

This is really a good addition IMHO!

 

[bfodnes]

Good visuals Rob.

The Plot seems to be a better way for me to tell good targets from bad then the analyze graph.

I wonder what object you had making those irregular sircles.

An aluminium pulltab is actally a " good " metal target, so is an aluminium screwcap. What makes them worthless is not the metals fault. Does the plot screen show irregularities in the targets make up better then actual metal reading?

Regards.

Bjorn

 

[TheMarshall]

Here's a few shots of the polar plot. Sorry about the focus. Straight is good curved is bad.
This is what junk looks like.
[attachment 158752 Junk.jpg]

Here's a wheatie.
[attachment 158753 Wheatie.jpg]

Here's a Quarter.
[attachment 158754 quarter.jpg]

************************************************************​

Hi Rc.....First...Thank you for the pictures.

Regarding the first one.....Junk.

Can you elaborate....was it ferrous or none ferrous ....even better, what was it originally part of?

If the sample scan was correct, and the resulting picture also therefor correct, then it suggests a LISSAJOUS type presentation for 'junk'.

I must admit, I am a little sceptical about that picture?........Perhaps you could do one of a steel screw, or nail.....please, to confirm matters.

As for the other 'normal' screen shots, they are logical presentation of target data that one can obtain from the present unmodified V3.

i.e. Magnitude and phase......but this visual polar plotting method is more 'readable' by non technical users, and so an improvement.

The anticipated advantage one would wish for, is that it will provide an easier visual assimilation of ferrous items than is presently available.

I applaud the provision of any form of 'aid' on a metal detector, above and beyond the basic VDI. The hobby is beginning to emerge from the 'Dark ages.'

Minelab's E-Trac.

Fisher's

Alain Loubet's DEUS.

Now Whites's Spectra Vi adds [size=x-large]more[/size] tools to its top box of goodies.....Well done Whites...........TheMarshall .

 

[Rob (IL)]

Here is a tab from a Coke can.
[attachment 158775 coke.jpg]

Here is a screw or nail, they look similar this was a steel screw.
[attachment 158776 screw.jpg]

That weird circular pattern further up in the post is what a crimped bottle top will show.

 

[TheMarshall]

Here is a tab from a Coke can.
[attachment 158775 coke.jpg]

Here is a screw or nail, they look similar this was a steel screw.
[attachment 158776 screw.jpg]

That weird circular pattern further up in the post is what a crimped bottle top will show.

**********************************************

Thanks Rc for the very prompt response.

The ferrous item....nail....Is spot on.....i.e. The plot now moves into another quadrant.

Now Rc....for the ferrous 'coup-de-gras'.....Can you produce it.

A clad coin please..copper on steel..zinc on steel whatever...Will it produce a 'loop' in one of the colours, (green)?

UK standing by for USA reply................TheMarshall

 

[Rob (IL)]

I showed a clad quarter. They produce straight lines no loops. Rob

 

[TheMarshall]

I showed a clad quarter. They produce straight lines no loops. Rob

**************************

I need a 'picture' of a steel cored clad coin.....anyone help?

The clad quarter I believe is a copper cored coin?....TheMarshall

Our UK 2p is copper clad steel core......But I don't have the Vi !!!!!!!

Thanks for all your help Rc......Good night all

 

[Jungle Jim]

All I see on 3 of them is VDI's of 19, 21, and 25. They all look the basically the same on the screen. The 19 is a gold ring, the 21 is a nickel, and the 25 is a tab from a coke can. All are 99%. I don't see enough of a difference to determine if the new screen is worth while or not. Am I missing something?

 

[Larry (IL)]

As Rob stated, the polar plot is just a tool to help you decide to dig or not. I have not seen a detector yet than can tell the difference between a tab and a gold ring. The person to build one that can will be a billionaire overnight..........