How Metal Detectors Work

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The first metal detector was created in 1881 by Alexander Graham Bell to detect the bullet lodged in the body of President James Garfield when he was assassinated. The first portable version was patented in 1931 by Fischer. Since then, this instrument has become very common. Here are some insights on the workings of metal detectors.

What is a metal detector?
An electronic instrument that can find any instance of metal from the ground, a human body or a parcel is called metal detector. It has the ability to pass through the sand, soil, wood and any other non-metallic items. It can track anything metallic.

How the metal detector is constructed?
An elementary metal detector has an electronic box along with a battery on one side, with a handle to let the operator place his arm. It has a coil made of insulated wire wrapped around the telescoping shaft and ends in a round plastic disk. The disk is displaced from the shaft making an angle that helps it to maintain parallel position to the floor. The operator holds the electronic box and switches on the power to start sweeping the coil slowly on the ground till there is an electronic signal. This signal shows...

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