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