| The first metal detector was invented by
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| | and magnetism, the electromagnetism
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| Alexander Graham Bell in the year 1881,
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| | affects on them. Magnetic field is
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| just after the invention of telephone in
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| | generated in this device through the
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| 1876. Later, Fischer came out with a
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| | transmitter (high-powered coil), getting
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| portable one in the year 1931. Today,
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| | power from the battery attached. When
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| metal detectors are used in many fields
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| | this electromagnetic field penetrates the
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| starting from treasure hunt to security
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| | ground the metals tend to get charged
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| purposes. These are electronic devices
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| | with magnetism. When this happens the
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| and are used to locate signs of metal. It
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| | coil detects the electromagnetic
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| is used to search on the ground, people
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| | behaviour and sends a signal to the
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| or goods. The materials can be on the
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| | electronic box. The speaker attached to
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| ground may be a piece of iron, aluminum,
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| | the electronic box beeps and the operator
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| etc or it can even indicate buried metal
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| | hears it and comes to know of the
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| could be anything from discarded pieces
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| | presence of metal. The latest detectors
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| of aluminum to buried resources. These
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| | comprises of microprocessors in the
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| detectors can penetrate various
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| | electronic box that can give you the type
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| non-metallic substances like soil, wood,
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| | of metal present. It can measure the time
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| sand, etc.
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| | between charging of metal and the
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| Metal detectors have electronic boxes
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| | receiving the beep that concludes the
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| with a battery case on one end and a
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| | type of metal and this length of time is
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| handle for the operative's arm on the
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| | known as phase shift. There are
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| other. It has a coil made of insulated
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| | adjustments in the device when searching
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| wire wound around a telescoping shaft
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| | for a particular kind of metal.
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| that is inside a plastic disk. The device
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| | There are 3 types of metal detectors
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| is held parallel to the ground due to the
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| | following 3 different technologies:
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| angle at which the disk comes out of the
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| | 1. Beat Frequency Oscillator: Such
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| shaft. The electronic box is held in the
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| | detectors have a coil acting as an
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| hand, the power is put on and the coil
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| | inductor inside an oscillator. With
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| end is slowly swept over the ground. If
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| | frequency change there is a change in
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| the trace of metal is there on or buried
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| | inductance. There is a second oscillator
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| in the ground, an electronic beep is
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| | that generates a close frequency. The
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| heard when the device sweeps the ground.
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| | beeps heard between them indicate the
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| The discovery of Electromagnetism was by
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| | presence of metal.
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| Hans Christian Oersted in the year 1820.
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| | 2. Induction Balance Detector: This type
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| It is the science of combined effect of
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| | has 2 coils that overlie each other. One
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| electric and magnetic field. As stated in
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| | sends waves and the other receives. The
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| wikipedia, Electromagnetism is the
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| | two are kept adjusted so that when there
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| science of the electromagnetic field.
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| | is absence of metal they do not indicate
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| That is, a field, surrounding all of
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| | or beep.
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| space, which exerts a force on those
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| | 3. Pulse Induction Detector: This type
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| particles that possess the property of
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| | produces pulses by putting off an
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| electric charge, and is in turn affected
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| | indicator. A coil sends the pulse and the
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| by the presence and motion of such
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| | detector searches for echos.
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| particles.
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| | If you have a metal detector, I wish you
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| This principle of electromagnetism is on
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| | luck in finding all kinds of treasures.
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| which the Metal detectors work. Since the
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| | You never know what "rare find" you'll
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| metals are good conductor of electricity
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| | come up with, and it's fun to look.
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