In addition to the type of coil and its shape, there are many configurations available in the market that you can choose depending on the exploration environment and the type of work you want to do. The difference in configurations depends on the location of the transmitter (TX) and receiver (RX) coils. In general, there are 5 different types of configuration, which we will examine below.
Concentric
This type of configuration consists of circular transmitter and receiver coils. The strength of this type of configuration is that both the transmitter and receiver coils are placed in their largest position in the mold, which allows for greater coverage of the ground as well as greater depth of exploration during exploration. All these factors together make this type of configuration the most widely used and common type of metal detector coil configuration. Also, these types of configurations make the metal detector’s pinpointing capability more accurate, but unfortunately, it is less sensitive than other configurations in fields with a lot of mineral particles.
Mono
This type of configuration is only available in pulse metal detectors. In this type of configuration, both transmitter and receiver coils can be placed together or one coil can be both transmitter and receiver. The detection and performance characteristics of coils with this type of configuration are very similar to loops with concentric configuration, but have better efficiency in mineral fields.
Imaging
Coils with this type of configuration are an upgraded version of concentric configurations that also have an additional receiver coil that is used to estimate the depth and size of the target. Using this extra coil, the metal detector is able to correctly identify the target and distinguish between it and soil debris (which have similar conductivity properties).
Double-D
This type of configuration is made to reduce interference from the ground side and also to compensate for the reduced efficiency of concentric coils in mineral fields. The arrangement of the receiver and transmitter coils in these types of coils eliminates ground fault signals. This is why these configurations are called DD because both the transmitter and receiver coils are in an English D shape. These coils are less sensitive than concentric coils of the same size in non-mineral fields.
