Minelab Equinox 15″ DD Smart Coil

TYPES OF SEARCH COILS

There are different types, sizes, and shapes of metal detector coils. The most common types of search coils are concentric search coils, mono search coils, double D search coils, and imaging search coils.

Concentric coils are the most common metal detector coils. They consist of two circular coils, one inside the other. The outside coil transmits the electric current, and the inside coil receives the response. Concentric coils are versatile and work well when detecting metals, as they have a symmetrical and balanced field.

Mono search coils are not quite as common, as they are only used on pulse induction metal detectors. These have both the receiver and transmitter on one coil. Mono coils have improved depth and sensitivity, but don’t work as well in mineralized areas that require better differentiation.

Double D search coils are shaped like two back-to-back D’s, and they are good for use in areas with heavily mineralized soils. The shape of this coil gives it better ground canceling capabilities, so there is reduced interference from ground signals. DD coils are often used for relic metal detecting.

Imaging search coils are similar to concentric coils but have more advanced targeting capabilities. They have a third coil that acts as a second receiver and allows for better target sizing and enhanced depth.