Description
1.0 INTRODUCTION
1.1 BACKGROUND OF THE STUDY
A metal detector is described as an electronic instrument which detects the
presence of metal nearby. Metal detectors are useful for finding metal inclusions
hidden within objects, or metal objects buried underground. They often consist of
a handheld unit with a sensor probe which can be swept over the ground or other
objects. If the sensor comes near a piece of metal this is indicated by a changing
tone in earphones, or a needle moving on an indicator. Usually the device gives
some indication of distance; the closer the metal is, the higher the tone in the
earphone or the higher the needle goes. Another common type are stationary
"walk through" metal detectors used for security screening at access points in
prisons, courthouses, and airports to detect concealed metal weapons on a
person's body [1][2].