How Metal Detectors Work at Depth
The depth capability of a metal detector depends on several factors.
- Target Size:
The depth of a metal detector is proportional to the size of the target. A larger target size allows the machine to detect at greater depths. Smaller targets, such as coins, cannot be detected at significant depths. While some believe that small objects can be detected at greater depths, this is not the case. Larger targets are required for substantial depth detection. - Age of Object:
The depth of detection is influenced by how long a target has been buried in the ground. Targets buried for extended periods develop a halo effect around them, enhancing their detectability at greater depths. - Soil Mineralization:
High mineralization in the soil can reduce the depth capabilities of a metal detector. In areas with high mineral content, the signals from the detector may not penetrate as deeply. - Rocky Terrain:
In places with a significant amount of rocks or minerals, the depth capability of a metal detector diminishes. Metal detectors struggle to distinguish signals from rocks, affecting depth accuracy. - Electrical Interference:
Electrically noisy environments, such as areas with power lines, can interfere with the signals of a metal detector, limiting its depth capabilities. - Metal Composition:
The composition of the target metal affects depth detection. Pure metals like gold can be detected at greater depths compared to alloys or metals with impurities.
To maximize depth detection, choosing suitable coil sizes and accounting for factors like target size, soil conditions, and interference is crucial.
