Metal detectors can detect not only munitions, but coins, keys and other metal objects.
In Battlefield archaeology, most of the exhibits are metal, such as fire bullets, cartridges, bullets, cannons and shells, shrapnel and swords, and so on, depending on the historical period during which the campaign took place. Therefore, the most important tool for field archaeologists is simple metal detectors.
Metal detectors are increasingly being used to help surface penetrating radar and other GPR systems. The SPR system, originally developed in the UK for the detection of plastic mines, is capable of locating anomalous objects below 30 metres above the surface. The system also provides a range of clues to help users identify exhibits that have not yet been dug out.
Now the metal detectors in addition to the basic detection alarm function, will generally provide a number of manufacturers carefully developed special features, such as:
The function of the surface balance: to benefit the machine correctly than to see whether the metal is not disturbed.
Selection function: Using different metal objects to the magnetic field response difference characteristics to select or exclude different categories of metal objects and alarm prompts.
The depth of the marking, can inform the detected metal objects buried possible depth.
Area markings: Can display the detected metal object size, provide operators to determine whether the excavation meets the needs.
Voice prompts: the operator can immediately be alerted by the voice, such as lighting-providing lighting to facilitate night operation.