PI decay profile of gold ring with nail?

[bklein]

Does someone have decay profiles showing a gold ring amongst nails - along with profiles of each separately?
I?ve seen them separately displayed but never together. Curious what the AQ must do to detect the ring.

[6666]

Maybe Green ?

[bklein]

Ok....no such diagram(?). What then do you think it is doing to discriminate gold?

[Ferric Toes]

Does someone have decay profiles showing a gold ring amongst nails - along with profiles of each separately?
I?ve seen them separately displayed but never together. Curious what the AQ must do to detect the ring.

What is AQ short for?

Eric.

[waltr]

Does someone have decay profiles showing a gold ring amongst nails - along with profiles of each separately?
I?ve seen them separately displayed but never together. Curious what the AQ must do to detect the ring.

I just looked through the curves I have recorded but none with both a nail and gold ring.
However, I do have curves of nails in different orientations and these curve are VERY different. A nail End on looks more like a US quarter and on side looks more like a nickle. Also a different nail gives a different curve and a bent nail verse straight nail is also different curves.

I do remember trying two different targets and found that the target with the strongest response totally over whelms the signal from the other target makes any possibility of determining ID impossible.

[Altra]

What is AQ short for?

Eric.

It's a Fisher prototype. Notice in the video he put a black tarp over his messy bench

https://www.youtube.com/watch?time_c...ature=emb_logo

Nail ring video

https://www.youtube.com/watch?v=KyXn7X0jZtA

[Orbit]

What is AQ short for?

Eric.

Similar to gs 5 and so tdi design by Eric Foster ...
Only one thing I don't understand is Fiser involved or someone representing the company name fiser ? Hi Eric all the best !

I have a finished device that does almost the same thing as this video clip it also has mute mode two tons 5khz tx etc.

[green]

I just looked through the curves I have recorded but none with both a nail and gold ring.
However, I do have curves of nails in different orientations and these curve are VERY different. A nail End on looks more like a US quarter and on side looks more like a nickle. Also a different nail gives a different curve and a bent nail verse straight nail is also different curves.

I do remember trying two different targets and found that the target with the strongest response totally over whelms the signal from the other target makes any possibility of determining ID impossible.

Haven't replied with a decay profile because I don't have any rings. Thought about using a US nickel. Made a ring with some copper wire. Like waltr replied, nail position makes a big difference. Nail centered on coil flat is a lot less signal than nail centered and vertical. Nail flat near the edge higher signal than centered. Including some charts with targets centered. First chart, recorded log amplifier out vs time. Second chart, charted log-log(amplifier out)target recording minus no target recording . Can do with targets in different positions if anyone is interested.

Coil_Rx(2)8inch round figure8, Tx oval around Rx

[Ferric Toes]

It's a Fisher prototype.

Ah, Yes, I have not been keeping up with new developments. AQ to me suggested Aquapulse which is still made by a UK company called Aquascan International. The present model is AQ1B.

Eric.

[greylourie]

It's a Fisher prototype. Notice in the video he put a black tarp over his messy bench

https://www.youtube.com/watch?time_c...ature=emb_logo

Nail ring video

https://www.youtube.com/watch?v=KyXn7X0jZtA

Nice to see progress on the Franco-American (?) front. When will it actually be in production and on shelves, I wonder...

[green]

Haven't replied with a decay profile because I don't have any rings. Thought about using a US nickel. Made a ring with some copper wire. Like waltr replied, nail position makes a big difference. Nail centered on coil flat is a lot less signal than nail centered and vertical. Nail flat near the edge higher signal than centered. Including some charts with targets centered. First chart, recorded log amplifier out vs time. Second chart, charted log-log(amplifier out)target recording minus no target recording . Can do with targets in different positions if anyone is interested.

Coil_Rx(2)8inch round figure8, Tx oval around Rx

Some thoughts. [ https://www.geotech1.com/forums/atta...8&d=1580669439 ] Subtracted the (nail) recording from the (nail ring) recording with Excel. Close to the ring recording, not exact. In general, targets side by side add, targets stacked don't. Didn't know what would happen with the ring and nail. Nail was stuck vertical in a 5/8 inch piece of foam. Placed nail over coil center with point touching coil(recorded decay). Ring was placed centered over nail 5/8 inch above coil center(recorded decay). Nail was removed(recorded decay) . Thin short time constant targets normally chart straight line decay linear X log Y. A US nickel hasn't in the beginning of the decay. Have thought decay is faster in the beginning with thicker targets was due to skin effect, current on surface only(higher resistance). Wasn't sure if not being straight line in the beginning with the nickel was real or my tester. The stranded wire ring does chart straight line decay with almost the same slope as the nickel. Think nickel is showing skin effect?

Maybe some skin effect, solid coin made with many rings. Smaller rings decay faster(less inductance)?

If ring is made with thicker solid wire and doesn't decay straight line is it because skin effect or inside of ring is smaller than outside?

[Orbit]

https://www.youtube.com/watch?v=ipD0SYACwc8
https://www.youtube.com/watch?v=P-vuvLK4tkk
https://www.youtube.com/watch?v=yoo3PS56-Uc
I have this completed in 2015 but I added now i section the same like on sheme TDI also I removed and added one amplifier in the tone section as well as the noise partas in TDI-SL, i tested in the soil Roman denarius over the cross two nails at a depth of 27cm-30cm detects in a strong clear tone I tested two VLF detectors at the same time neither could find at all roman denarius ...Of course he ate some of the letters on the label

[bklein]

Are you suggesting the TDI would pass this test as well? I don’t know anyone that has said this for sure.
What is the design key to being successful ignoring iron but seeing the ring?
You can see in the Tech forum things are getting exotic with dsp micros and fpga’s but this is being achieved with analog designs!