Ground balance compensation coil

[Ivont]

This design tried it in an ellipse and it gives good aerial results. Now I don't have a housing for the new one. I'll have to come up with something.

[Detectorist#1]

Hi Ivoint.
Are you believe strange coil's configurations will solve some discriminations problems in metal detecting?

[Ivont]

[Ivont]

https://www.geotech1.com/forums/foru...me=#post203837
This method looks good. Has anyone made a similar device?

[pito]

Google _ super dd coil

[Ivont]

Hello guys. How long does it take for a signal from the soil to decay after a Tx current duration of 60 us. Coil diameter, 30 centimeters, inductance, 350 uH, current, 1A.
From - To?

[Ivont]

Pito, thank you.

[Ivont]

Google _ super dd coil

Hello, Pito. Is it true that the decay time of the ground response can be in the range of 90 to 200 us.

[Carl-NC]

Ground decay depends on the ground. Ferrite-like mineralization is almost instantaneous and vanishes in 1-2 us. Viscous mineralization takes longer and depends on the composite decay coefficient and the peak strength. Yes, it can extend beyond 100us.

[Ivont]

Ground decay depends on the ground. Ferrite-like mineralization is almost instantaneous and vanishes in 1-2 us. Viscous mineralization takes longer and depends on the composite decay coefficient and the peak strength. Yes, it can extend beyond 100us.

Thank you, Carl. So the mineralization remains in the spike formed by the reverse electromagnetic field.

[Carl-NC]

Correct.

[pechkata]

Hello boys.
I've mentioned it before - that a high peak doesn't help with mineralization.
It's another matter who wants to dig how much.

[remi007]

Hello, esteemed group. After twenty years I intend to return to designing MD, but first knowledge and science. A question about the BUCK balancing coil in the BM950 type coaxial probe. What if the BUCK coil is inside the receiving coil? What advantages and what problems will arise?

[Carl-NC]

You can place the bucking coil outside, inside, or above the RX coil. They all work about the same.

[remi007]

Thank you Carl