Who needs 3D imaging? Is it useful at all in normal searches?
And yes and no… The reason is simple, it is quite a hindrance, which requires some knowledge and imposes a work regime. First of all, we need to properly configure the data logger and metal detector set, and not everyone is suitable for this. It is best to have the device working in static mode with VCO modulation. What does it mean? The tone changes – intensifies and weakens over the target, something like the so-called tracking function. Pinpoint in a dynamic detector. There is also the connection – wiring and signal calibration.
A good device is an equipment working as a PI or pulse induction – pulse detector. The advantage is the performance and stable operation on difficult ground, and the disadvantage is the lack of discrimination. It should be remembered that the imaging will concern rather larger objects. It depends on the probe, of course, but drawing the shapes of coins is rather pointless. We are interested in larger objects and such devices indicate this. The upside is that it’s the little bits that are omitted. It can be safely assumed that the 2×2 meter frame probe signals well objects the size of a can or larger.
The shape, approximate size, and depth are really good information. In an urbanized area, working with this type of device is more difficult due to evidence of human presence and infrastructure, such as pipes or wires. The advantage is also the visualization of empty spaces, such as basements, cavities, etc. A great solution for non-invasive research, site checking, and for commercial documentation of sites.
Currently produced devices, such as the GDI Icon 3D data logger we offer, are a fully wireless solution, for which a simple tablet based on the Android system is enough. If such a set is compared even with the finished Nokta Makro Invenio PRO product, it is 1/3 of the price and we have the option of choosing a detector with which the data logger works and thus slightly better performance, although at the cost of lack of discrimination.
In the end, there is the work regime, after the settings related to the type of detector and probe, select the sweep pattern. The software gives voice messages, and we follow the commands, i.e. we move at a certain time over a certain distance. It is worth marking the route with tape or plastic markers.
In the end, it remains to analyze the data in the form of a 3D chart and enjoy the results of our work!