Why do pulses detect rocks and bricks??

[Toddy from Scotland]

On my beachs I dig large rocks and building bricks?? It is very annoying. I am using the GQSS and also the Whites PI does this too. I am new to PI detectors. Am I right in thinking that I need a pulse with a manual GB to sort this like on land?

 

[desertdon]

When you fire bricks, the surface reads like iron oxide and it may take a ground balance PI like GS to read thru it. Maybe yours can be adjusted, Mr Bill or Reg will have to answer that. The rocks apparently have iron content, same applies to them. Don

 

[Toddy from Scotland]

Thanks Don

 

[wyndham]

I was just watching a show on the geology of the Great Lakes and the rock formations and remembering also the continental plate spreading where the magnetic signature is recorded into the hot molten rock as it wells up.
Bricks and other iron material would also record the magnetic pole sig as it cools in a kiln and I guess this might be at a cooling cycle below where heat destroys any magnetic line in the material. I wonder if this information might be useful in a microcontroller PI. Just some random ideas, Wyndham