Quote:
Originally Posted by J_Player
Hi ma330,
There is no practical circuit which can be applied to determine iron in the Earth(from 30cm -3m).
in order to deterimine iron which is the size of a small nail at -3m depth, you need to use a good magnetic sensor such as flc-100 or proton magnetometer. Possibly a Honeywell fluxgate magnetic sensor can find a small nail at this depth if it is configured as a gradiometer. Cheap coil magnetometers cannot give reliable readings into the ground at the depth of 3m for small iron objects. There is also the problem of mineralized ground. If you move the magnetometer over ground that has hot rocks such as basalt, or even sands which contain magnetite, hematite, then you will find a magnetic response much larger than a small nail buried at -3m. This response from hot rocks can confuse your detection so you will not know if you found an iron object, or a hot rock, or mineralized ground.
However, a ferrite can discriminate to tell if a buried metal object is simply hot rocks and iron, or if it is non-ferrous, if extra electronics are added to transmit a VLF signal, then measure the difference in phase angle which is transmitted and received from the ground. This is how VLF metal detectors can tell the difference between iron and non-ferrous metals which they locate.
Best Wishes,
J_P
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tank you j-p
I do not need to be too small to detect a metal object at a depth of 3 m.I need a circuit that identifies a metal object 50 cm to 2 m in depth.Smaller metal at a depth of 50 cm.Respond to iron ore and other magnetic material.Like a ferrous mineral streaks.
Please show me a schematic of a magnetometer with ferrite
tank you very much