Metal Detectors

Introduction:
Metal Detectors are basically used to find out objects that are metallic. Apart from this basic use of metal detectors they are also helpful in detecting land mines,weapons and other similar jobs.

How metal detectors work?
Metal detectors are manufactured using various smaller devices,one of which is an oscillator that produces A.C. current which when passes through a coil generates an alternating magenetic field.
One of the coils is used to measure the magnetic field.Due to the presence of magnetic substance,the variation in the magnetic field can be used as an approach to measure it.
The microprocessors present in the metal detectors figure out the type of the metal present.Metal detectors work on the principle of electromagnetism.

History:
During the 19th century,scientists were trying to invent such a device that can be used to detect metallic presence.Various devices that were initially developed had a very limit scope and they required a lot of energy to perform this task,so they were not very successful.
In 1937, Gerhard Fisher developed a system keeping the concept limited to radio direction-finding for accurate navigation.This invention was very successful and hence he instantly got its rights patent.

Scope of metal detectors:
They can be used to detect metals even inside sand,mud,wood.They are very handy for the purpose of archeology,security screening,treasure hunting and various similar tasks.