Coil Size and Shape: The Key to Successful Metal Detecting
Coil Size and Shape: The Impact on Metal Detecting
Metal detecting is a fascinating hobby that has gained popularity over the years. It involves using a metal detector to locate metallic objects buried underground. One of the critical components of a metal detector is the coil, which plays a significant role in determining its sensitivity and performance.
The size and shape of the coil have an impact on how well it can detect metals, making it essential to choose the right one for your needs. In this article, we will delve into how coil size and shape affect metal detecting.
Coil Size
The size of the coil determines its detection range or depth. A large coil covers more ground, making it ideal for searching large areas quickly. However, larger coils are less sensitive to small targets compared to smaller ones.
On the other hand, small coils are suitable for finding smaller targets such as coins and jewelry because they have higher sensitivity levels than larger coils. They also provide better target separation, allowing you to distinguish between multiple signals from different objects that may be close together.
Most detectors come with interchangeable coils that you can switch depending on your requirements. For instance, if you’re searching for larger items such as relics or artifacts in open fields or beaches, a larger coil would be more appropriate since it offers greater depth penetration and ground coverage.
However, if you’re looking for smaller items like coins or jewelry in highly mineralized soil conditions where there’s likely to be interference from other minerals present in the ground (such as iron), then a smaller-sized coil would work best since it has better target separation capabilities.
Coil Shape
There are two primary shapes for metal detector search coils – concentric and double D (DD). Each shape has unique characteristics that determine its suitability based on certain conditions:
Concentric Coils: These have two circular-shaped loops positioned one inside another resembling concentric circles hence their name. The outer loop transmits electromagnetic waves, while the inner loop receives the signals reflected back from metallic objects.
Concentric coils are ideal for detecting small targets such as coins and relics in areas with low to moderate mineralization levels. They provide better depth penetration than DD coils of similar size and have better discrimination capabilities.
However, they’re not suitable for highly mineralized soils since they’re more prone to interference from minerals present in the ground. As a result, concentric coils may produce false signals that could lead to wrong target identification.
Double D Coils: These have two overlapping D-shaped loops positioned opposite each other facing in the same direction. One loop transmits electromagnetic waves while the other receives them after being reflected back by metal objects.
DD coils are suitable for searching large areas quickly due to their superior ground coverage capabilities. They’re also less affected by mineralization compared to concentric coils, making them ideal for use in highly mineralized soil conditions such as iron-rich areas or beaches where there’s likely to be lots of trash (e.g., pull tabs).
They provide excellent target separation abilities, enabling you to distinguish between different metals buried close together accurately.
Conclusion
In conclusion, choosing the right coil size and shape is crucial when it comes to metal detecting success. It’s essential to consider your search conditions (i.e., soil type/mineralization levels) and what you’re looking for before selecting a particular coil size/shape combination.
For instance, if you’re searching for larger items like relics or artifacts on open fields or beaches with low/moderate mineralization levels, then a larger-sized concentric coil would be more appropriate since it offers greater depth penetration and ground coverage capabilities.
On the other hand, if you’re looking for smaller items such as coins or jewelry in highly mineralized soil conditions where there’s likely to be interference from other minerals present in the ground (such as iron), then a smaller-sized double D coil would work best since it has better target separation capabilities.
Ultimately, the key to successful metal detecting is finding the right balance between coil size and shape based on your search conditions and personal preferences. With the right combination, you can maximize your chances of finding hidden treasures while minimizing false signals and interference from surrounding minerals.