Deeper then deep! How?

[Loola]

I am just looking for facts, experience and theories behind a deep searching PI MD.
To get things rolling, I will throw some numbers (feel free to change them).
Search coil: >2 meter.
Search depth: >15 meter.
Target: 15kg of aluminium or iron. Pick one, you choose


I am trying to find as many aspects of this as possible and hoping for more colorful answers
than "just pump up the TX amperage" or from those just screwing around acting Time Thieves.


And for those who wonder what this thread is about. Follow the link in post #4.
That is a good example.


And when it comes to magnetometers, leave that. I have already built a PPM. This is about PI MD's.

[ivconic]

True. On reflection, I was recalling a time before these powerful neodymium magnets were available.

Again, it emphasises the point that it make sense to specify whether ferrous or non-ferrous targets are the intended target. If it was non-ferrous then the most powerful of magnets would be useless.

I expect those that comb the Thames bring up some interesting stuff, like bicycles, shopping trolleys, maybe the occasional motorbike.

Eric.

I can't disclose everything. But yes, most of the finds are like that.
But you'll be surprised to know that also there are some prehistorical finds in the mud too.
Iron age. Deep in the mud. Therefore preserved well.

[ivconic]

I am just looking for facts, experience and theories behind a deep searching PI MD.
To get things rolling, I will throw some numbers (feel free to change them).
Search coil: >2 meter.
Search depth: >15 meter.
Target: 15kg of aluminium or iron. Pick one, you choose
I am trying to find as many aspects of this as possible and hoping for more colorful answers
than "just pump up the TX amperage" or from those just screwing around acting Time Thieves.
And for those who wonder what this thread is about. Follow the link in post #4.
That is a good example.
And when it comes to magnetometers, leave that. I have already built a PPM. This is about PI MD's.

I don't know why; but i seriously doubt that.
Your "poetic" style resembles indeed much on recently banned leech from China.
Who spammed numerous topics on this forum with pretty much the same demands and questions.

[Skippy]

I have just looked through your post history, Loola, and found this forum thread, containing some relevant information:
https://www.geotech1.com/forums/show...327#post248327

It would help others to understand your requirements if they read this thread.

[ivconic]

Sometimes i am too paranoid and suspicious.
This time i am wrong, so it seems.
Ok, let see:
"...
Search coil: >2 meter.
Search depth: >15 meter.
Target: 15kg of aluminium or iron. Pick one, you choose
..."

"15kg" can be small or large metal mass area. Not the same.
Obviously tough demands.
Can it be done without pumping up very high current? (there is protest against that approach)
If coil is >2 meter than you can't make it with thin wire. It will have unacceptable resistance.
With many wires in parallel; resistance will lower, but what about inductance?
So it must be very "slow" coil anyway. PPS low. High current too.
If we still do speak on PI technology.

[Ferric Toes]

I can't disclose everything. But yes, most of the finds are like that.
But you'll be surprised to know that also there are some prehistorical finds in the mud too.
Iron age. Deep in the mud. Therefore preserved well.

You are right! I know a 'mudlarker' as they call themselves, he finds Roman coins and jewelry as well. I had a go myself once but you definitely need a discriminating detector as there is so much junk. During my low tide search an old pound note floated by on the water. I quickly grabbed it and didn't believe my eyes when a ten shilling note drifted by too. When dried out they appeared to be almost mint condition and checking them further showed they were printed in 1938. The only explanation I could think of was that maybe they were from a robbery and a box of them had been dumped in the Thames when they had got too hot. Over the years the box had decayed and the notes had started floating out.

Eric.

[ivconic]

You are right! I know a 'mudlarker' as they call themselves, he finds Roman coins and jewelry as well. I had a go myself once but you definitely need a discriminating detector as there is so much junk. During my low tide search an old pound note floated by on the water. I quickly grabbed it and didn't believe my eyes when a ten shilling note drifted by too. When dried out they appeared to be almost mint condition and checking them further showed they were printed in 1938. The only explanation I could think of was that maybe they were from a robbery and a box of them had been dumped in the Thames when they had got too hot. Over the years the box had decayed and the notes had started floating out.
Eric.