Debate about the gradiometer

[moltazim]

good morning
Does the Gradometer metal detector detect gold?
Or is it intended for magnetic metals
and What is the best gold detector machine?
Thank you

[Carl-NC]

A gradiometer usually refers to a magnetometer which only detects ferrous/magnetic metals.

There is no answer to your other question.

[moltazim]

Merci beaucoup, Monsieur Carl, pour votre r?ponse
Cependant, il existe certains appareils Gradometer attach?s ? l'analyse des donn?es qui diff?rencient les m?taux ferreux et non ferreux.
for exemple https://www.youtube.com/watch?v=WMawYzRboMM

[Qiaozhi]

Merci beaucoup, Monsieur Carl, pour votre r?ponse
Cependant, il existe certains appareils Gradometer attach?s ? l'analyse des donn?es qui diff?rencient les m?taux ferreux et non ferreux.
for exemple https://www.youtube.com/watch?v=WMawYzRboMM

Please read the forum rules -> Basic Rules of the Forums
and make your posts in English.

[moltazim]

Thank you very much, Mr. Carl, for your response
However, there are some Gradometer devices attached? S? data analysis? who are you different? rent the m? ferrous and non-ferrous rates.

[Carl-NC]

The video says it will detect "metals" and "voids". I did not see it specify ferrous or non-ferrous. If it is a magnetometer-gradiometer then it will not detect non-ferrous. I find many of these devices to have grossly misleading claims about their abilities and even the technology used. Caveat emptor.

[WM6]

Not to discuss specific device.

But there could be a way to detect "void" ( maybe proper term) too, using such magnetometer.

If device manifest (or is provided to set) some sort of audio threshold, then "void" could be
related to absence or reduction in volume of audio threshold this way:

[Carl-NC]

Not to discuss specific device.

But there could be a way to detect "void" ( maybe proper term) too, using such magnetometer.

If device manifest (or is provided to set) some sort of audio threshold, then "void" could be
related to absence or reduction in volume of audio threshold this way:

Yes, that is how a mag can detect a void. A mag can detect fluctuations in the Earth field, whether from an iron target, or a concentrated pocket of black sand, or from a (large enough) void in mineralized (enough) soil. If a buried gold cache is large enough, then the "void" it creates in mineralized ground could be detectable. But a mag cannot detect the gold itself.

There are quite a few of these "treasure imaging" devices on the market. Most of them are based on fluxgate mag sensors, and most of them come with wild claims tailored to attract starry-eyed treasure hunters.

BTW, voids can also be detected in a similar manner by a non-ground balanced metal detector. The old TF900 and TM800/808 locators had a "cave mode" for that purpose.

[WM6]

But a mag cannot detect the gold itself.

Curious, if large gold deposit (large gold vein) can be magnetically so different from surrounding soil
that can with magnetometer act as some sort of detecting hole?

[moltazim]

Magnetometers and gradiometers
These machines operate vaguely similar to ground radars, however they are not ground radars! Depending on the arrangement of the sensors and their number in the antenna, we speak of a gradiometer or a magnetometer. These machines have become more democratic in recent years. Thus, more and more people are using it to find ancient tunnels, mineral deposits, or deeply buried tanks. A palette of different colors allows identification of various materials and objects, visualization of their volume and size. Their approximate burial depth can also be determined by extrapolating the signal strength.


It is a technology based on the emission, transmission and reception of electromagnetic waves. The processing and analysis of the signals received provide an image of the subsoil or the interior of the structure being examined. Designed around one or more sophisticated antennas or sensors with wide bandwidth, the magnetometer / gradiometer, by emitting waves that penetrate the ground, receives the reflected waves which are then analyzed via a computer in real time (or not) and retransmitted on the screen. These "irregularities" in the basement appear before your eyes in 2D or even 3D. The software can be updated. You need to connect the magnetometer to a laptop or tablet that will do the calculations in real time.


Often magnetometer manufacturers use sensors from the same supplier. This implies having to detect with the north behind your back which is impractical.


A magnetometers cannot discriminate between metals (we can at best assume that it is a ferrous object in some cases) nor can it distinguish between a stone, a shoe or a coin, because the densities of these objects are the same. Many manufacturers present their machines as "the miracle radar", but this does not exist. Never forget that radars and magnetometers detect "irregularities" in the ground; it is generally necessary to cross the data with a metal detector see resistivity meter to obtain a definitive opinion, that is to say to differentiate between a stone or a metallic object. Sometimes you even have to dig without knowing what is under your feet.


Our selection of magnetometers / gradiometers:

[Carl-NC]

Magnetometers and gradiometers
These machines operate vaguely similar to ground radars...

No, they operate nothing at all like GPR.

It is a technology based on the emission, transmission and reception of electromagnetic waves.

The processing and analysis of the signals received provide an image of the subsoil or the interior of the structure being examined. Designed around one or more sophisticated antennas or sensors with wide bandwidth, the magnetometer / gradiometer, by emitting waves that penetrate the ground, receives the reflected waves which are then analyzed via a computer in real time (or not) and retransmitted on the screen.

Wherever you got this from, it's a load of crap.

[moltazim]

I found this fraud in the information on this site:
https://blog.lefouilleur.com/
https://www.lefouilleur.fr/fr/blog/p...ndeur-n28.html

[ivconic]

I found this fraud in the information on this site:
https://blog.lefouilleur.com/
https://www.lefouilleur.fr/fr/blog/p...ndeur-n28.html

You got it all mixed up and wrong.
I just visited that page and read all what's on it.
Lot of "principally" piled up facts, alright.
But i can't find where is the magnetometer defined as you describing it?
Even if i missed that, don't get it all as a fact; what you read on the internet.
Some "misty" companies that selling plain magnetometers; often make lot of false claims in their advertisements.
Purposely mixing some truthful facts taken from different technologies and making up the whole story actually totally wrong.
One small example: OKM. Most of their devices are nothing but magnetometers.
We know that magnetometer can not locate gold, for example. Yet they at OKM claims opposite.
Go figure!
Magnetometer is well explained on these forums already.
It is "passive" device, "emitting" absolutely NOTHING.
It has a sensor able to sense and measure magnetic field, changes in the field and field strength.
So it is "passive" and it is more like "receiver" if you like.
Gradiometer - magnetometer is magnetometer with two or more sensors. Able to measure "gradations" between sensors.
...
GPR is inappropriate term to mix with magnetometers.
GPR stands for Ground Penetrating Radar. Therefore it works similar to any radar. It emits strong current in soil on very high or ultra high frequencies.
It has therefore the "transmitter" and also it has the "receiver" too.
Usually two identical antennas coupled close, put in common enclosure and designed for only one precise frequency.
So you can usually see such devices in offers with several different antenna setups. Each for different frequency.
Etc.
I can write here more redundant text if you like.
But this is already well explained in the past on forum.
You can use search option and find some old topics.
Better do that than to disturb Carl any further!

[moltazim]

Thank you very much for the clarification, but I am not here to bother Mister Carl because some of my friends bought a gradometer from that store and frankly mentioned this information to him. They are fraudsters.

[ivconic]

Thank you very much for the clarification, but I am not here to bother Mister Carl because some of my friends bought a gradometer from that store and frankly mentioned this information to him. They are fraudsters.

Sadly yes, it is true. We may call such manufacturers and sellers as fraudsters.
.