When solving a whole range of historical and search tasks, special equipment is used, which has been developed for decades by geophysicists. Magnetometers are successfully used not only in the search for large metal objects, such as armored vehicles or aircraft of the Great Patriotic War, humanitarian demining, but are also used when working on the territory of historical and archaeological monuments, as one of the methods of non-destructive search and control.
Depending on the goals and objectives, different types of magnetometers, gradiometers or deep metal detectors are used. The main thing is to understand what tasks need to be solved, what and where to look for and with what device, then the issues of “monetary resources and attracting qualified specialists” will be secondary… For example, magnetometric mapping, relatively labor-intensive and long-term, should not always be carried out.
A little theory. Magnetometers for field work are divided by types into “ferrosonde”, “proton” or “quantum on the principle of optical pumping” …
3. “Quantum with optical pumping” (on the Zeeman effect)
3. “Quantum with optical pumping” (on the Zeeman effect).
Modern magnetometers from the companies Geometrics, Scintrex, GEM Systems. Similar in purpose to the previous ones, but much more sensitive (by two orders of magnitude) and therefore more expensive. Interference from external objects, such as power lines, does not affect the readings and a second device for shooting variations is not required. They are usually used for professional geophysical work on mineral deposits. However, this type of magnetometers is used by American sappers when clearing mines. The high cost allows you to supplement the device with operational visualization as well.
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