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Frequency technical query......
- Thread starter Gaz
- Start date
TURNMASTER
Active member
Yes, but I just accept it because I can not explain it. Randy can though. It has some thing to do with conductivity and rust and eddy currents and wave length. If you look you can find this topic has been discussed in the last couple years in this forum. Seems DD coils also like iron. I always figure I do not need to know why as much as I need to adapt and gain skill to use the machine. I seems to be working and the understanding of the why eventually comes through study. This theory has served me well in my chosen trade also.
Good Luck
Just displaying my ignorance
HH
Jeff
Good Luck
Just displaying my ignorance
HH
Jeff
A target with high conductivity and high inductance provides a long time constant.
A target with low conductivity and low inductance provides a short time constant.
Higher frequencies are optimized to identify targets with a short time constant.
Lower frequencies are optimized to better identify targets with a longer time constant.
With that said, deeply buried iron typically presents low conductivity, but high inductance (due to the effect of the magnetic properties on the eddy currents). That contributes, I believe, to why I can better decipher the signals of deeply buried iron with the 3 kHz coil, compared to the other two frequencies.
JMHO HH Randy
A target with low conductivity and low inductance provides a short time constant.
Higher frequencies are optimized to identify targets with a short time constant.
Lower frequencies are optimized to better identify targets with a longer time constant.
With that said, deeply buried iron typically presents low conductivity, but high inductance (due to the effect of the magnetic properties on the eddy currents). That contributes, I believe, to why I can better decipher the signals of deeply buried iron with the 3 kHz coil, compared to the other two frequencies.
JMHO HH Randy