PI metal detector

[grisha_iskatel]

I am engaged in the production of PI metal detectors in Ukraine. We have widely used pulse metal detectors with large coils to search at great depths. But they do not discriminate against metals.

Do you use such metal detectors in the US, do you have something like that on sale? And in general do we need metal detectors in the USA without discrimination of metals

 

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[Loco-Digger]

From my understanding PI machines do not discriminate and are great relic machines going deep.

 

[Rick K]

Up to now, no PI detector with a useful degree of iron ID or discrimination of iron has made it to market.

The new “Manta” project which has been taken over by Fisher shows some promis of doing this, but it does not provide for ground balancing inland in typical prospecting ground.

 

[DeepseekerADS]

As for competition, most major detector manufacturers offer PI machines.

And they are readily available through out the United States. You would have some major competition here from proven equipment.

 

[Slingshot]

There are several manufacturers of PI machines in the US. The PI machines are mostly used for salt water beach detecting for coins and jewelry, with some being used to search for old relics. Most Americans use IB metal detectors in the VLF frequencies that have discrimination abilities.

 

[Terry Soloman]

I am engaged in the production of PI metal detectors in Ukraine. We have widely used pulse metal detectors with large coils to search at great depths. But they do not discriminate against metals.

Do you use such metal detectors in the US, do you have something like that on sale? And in general do we need metal detectors in the USA without discrimination of metals

Welcome from White Plains, New York!

Yes, we use Pulse Induction machines in the U.S.A., mainly on saltwater beaches, looking for old war relics, and "nuggetshooting" for natural gold nuggets. I use the Tesoro Sand Shark, on beaches, and the Minlab GPZ 7000 in the goldfields of Arizona. I would like to try one of your machines.

 

[DeepseekerADS]

I would like to try one of your machines.

Yes, send Terry one of your machines! He will tell you the truth on his impressions, and will be completely honest.

 

[grisha_iskatel]

Many thanks for your answers.
In our country, mostly pulsed metal detectors are used to search for relics from the Second World War. With large coils as in the photo.


We have such a metal detector costs 200-240 US dollars, is it a lot or not for the US?
But we have a project and with a small basket reel for finding small ornaments and nuggets.

 

[grisha_iskatel]

Welcome from White Plains, New York!

Yes, we use Pulse Induction machines in the U.S.A., mainly on saltwater beaches, looking for old war relics, and "nuggetshooting" for natural gold nuggets. I use the Tesoro Sand Shark, on beaches, and the Minlab GPZ 7000 in the goldfields of Arizona. I would like to try one of your machines.

Tell me please: Is discrimination necessary when looking for gold? and what size nuggets do your metal detectors see and at what depth (small sizes of nuggets)?

 

[Terry Soloman]

No, we do not use discrimination hunting gold nuggets The Minelab GPZ 7000 has found sub-gram gold as deep as 9" - 10"; a 1-ounce nugget at 36" - 40" - while single-frequency VLF machines find sub-grain gold from 1" - 4" deep that the PI machines sometimes miss

 

[99thpercentile]

I don’t understand the logic when I read people say that time domain electromagnetic induction (TDEM), also known as pulse systems, can’t discriminate. TDEM systems are the gold standard for discrimination when looking for unexplored ordnance (UXO), landmines or improvised explosive devices (IED). I work for the department of defense (DoD) and we have spent 20+ years testing and refining the design of metal detectors and magnetometers for these applications. There are several instruments that are now available that have achieved 100% scores on the receiver operating characteristics (ROC) curve over both seeded and live sites. What does this series of strange words and acronyms mean? This means the 100% of the UXO on a site were correctly detected, discriminated, and classified. Detected means that they were all located. Discriminated means that they were correctly sorted into either UXO or non-UXO. Classified means that each item that was discriminated as being a UXO was classified as exactly what type of UXO it was (I.e. 155 mm, 20 mm, or BLU). If you want to read more about these programs, you can go to the websites for the Strategic Environmental Research and Development Program (SERDP) or the Environmental Security Technology Certification Program (ESTCP).

Here are some of the TDEM instruments that are currently being used for these applications. All of them use at least one transmit coil, while several use three orthogonal transmit coils. All of them use multiple three component receive coils. The receivers measure multiple time gates so that the complete decay curve can be measured. The decay curve data can be used to determine the depth, orientation, shape, and size of each target. This information is know as the full polarizeability tensor for the target. The polarizeability tensor data can then be matched to a library of all known UXO to classify them.

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