Pinpoint Detectors was Created By Metal Detecting Enthusiasts for Metal Detecting Fans

The Interesting History of Metal Detectors

It is believed that the first metal detector was created by Alexander Graham Bell in 1881 in order to locate a bullet that was lodged in the body of the then President of the USA, James Garfield after he was assassinated. However, the first portable version of the metal detectors was in fact patented by a Dr Fischer in 1931 and since then metal detectors have become very common. Below is provided an explanation on the way in which a metal detector works.

1. A metal detector is an electronic instrument which is able to find any instance of metal whether it is in the ground, a human body or inside an object such as a parcel. It is able to pass through, sand, soil, wood or any other non metallic object to find the metal it is looking for.

2. The construction of any elementary metal detector is as follows:- It has an electronic box together with a battery on one side with a handle for the operator to hold it. Then a coil is made from insulated wire which is wrapped around a telescopic shaft and at the end of this is a round plastic disk.

What the operator then needs to do is switch on the power and begin sweeping the ground slowly until an electronic signal sounds or changes frequency. This signal indicates that there is a metallic object or item present under the area where you have just swept with the metal detector.

3. A metal detector works on the principal of using electromagnetism which exerts an effect on metal objects or items. The metal coil on the metal detector is called a transmitter and using the battery power it generates a magnetic field which works on the area surrounding it. When this magnetic field enters the ground it causes any metallic item it comes in contact with to become magnetic and this results in an electronic signal which is detected by the receiver in the coil. The receiver then dispatches the signal it has received to the electronic box which contains a speaker and this in turn emits a beep for the operator to know that metal has been detected.

In each electronic box there is a microprocessor which measures the time lag between charging the area being searched and the electronic box actually receiving the signal. This time lag is known as the phase shift and lets the operator known which metals are present and by using this principle, people are able to configure their high end metal detectors to look for specific metals.