Metal Detector or any type of detector is essentially a detector of the field of metals or Gold and Silver
The field of metals or gold and silver all has electrons The rotation of electrons around the atom forms the conditions of high power energy to create the field of metals or gold and silver and targets
In general any type of metal detector or detector or ground penetrating radar or antenna metal detector the same as a long range locator or GPR must capture the field of metals or Gold and Silver in depth during testing and separate and discriminate
Any type of metal detector or detector that captures the field of metals or gold and silver in depth during testing and separates and discriminates has essentially captured the electrons related to that metal or targets and gold and silver which is the combination that forms the field of metals or gold and silver and targets
Source of books by the scientist of electronic sciences of radar Ramin Keykhosravi with permission