Question 1

How do Metal Detectors Work?

Accepted Answer

Metal detectors feature a search coil, and that coil sends out an electromagnetic field into the ground. Metal objects (known as targets) that are located within the electromagnetic field the metal detector puts out become energized, and those objects retransmit their own electromagnetic field. The search coil of the metal detector than receives the retransmitted field that the metal objects have created and sends a signal to the detector, or a “target response”.

Question 2

What is “falsing”?

Accepted Answer

The term “falsing” refers to false signals, or “phantom” signals. They appear whenever a metal detector responds to metal when in reality, no metal is in the area. Typically, false signals are the result of naturally-occurring iron oxides in the ground; hematite and magnetite, for example.

Question 3

How do operating frequencies affect results?

Accepted Answer

Generally speaking, the lower the frequency, the deeper it will be able to penetrate the ground. However, at low frequencies, the sensitivity to small targets that have low conductivity is minimized. The higher a detector’s frequency is, the more sensitive it will be to small targets; but, it won’t penetrate as deeply.

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