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Thread: Metal Detector Accessories

  1. #1
    Zinc
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    Metal Detector Accessories

    Different metal detectors work in various different ways, but here's the science behind one of the simpler kinds. A metal detector contains a coil of wire (wrapped around the circular head at the end of the handle) known as the transmitter coil. When electricity flows through the coil, a magnetic field is created all around it. As you sweep the detector over the ground, you make the magnetic field move around too. If you move the detector over a metal object, the moving magnetic field affects the atoms inside the metal. In fact, it changes the way the electrons (tiny particles "orbiting" around those atoms) move. Now if we have a changing magnetic field in the metal, the ghost of James Clerk Maxwell tells us we must also have an electric current moving in there too. In other words, the metal detector creates (or "induces") some electrical activity in the metal. But then Maxwell tells us something else interesting too: if we have electricity moving in a piece of metal, it must create some magnetism as well. So, when you move a metal detector over a piece of metal, the magnetic field coming from the detector causes another magnetic field to appear around the metal.

    It's this second magnetic field, around the metal, that the detector picks up. The metal detector has a second coil of wire in its head (known as the receiver coil) that's connected to a circuit containing a loudspeaker. As you move the detector about over the piece of metal, the magnetic field produced by the metal cuts through the coil. Now if you move a piece of metal through a magnetic field, you make electricity flow through it (remember, that's how a generator works). So, as you move the detector over the metal, electricity flows through the receiver coil, making the loudspeaker click or beep. Hey presto, the metal detector is triggered and you've found something! The closer you move the transmitter coil to the piece of metal, the stronger the magnetic field the transmitter coil creates in it, the stronger the magnetic field the metal creates in the receiver coil, the more current that flows in the loudspeaker, and the louder the noise.
    Last edited by madfranks; 5th April 2018 at 12:19 PM.

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    Zinc
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    Re: Metal Detector Accessories

    "What do you think about cyber security. In my opinion, it is very good if company outsource this task to company with appropriate experience. Cyberattacks have become one of the most serious security threats facing businesses today and causing increasing levels of disruption.
    Last edited by madfranks; 9th April 2018 at 12:52 PM.

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    Unobtanium osoab's Avatar
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    Re: Metal Detector Accessories

    We got two bots here? Why didn't you delete the op madfranks?
    “Democracy is also a form of worship. It is the worship of Jackals by Jackasses. It is the theory that the common people know what they want, and deserve to get it good and hard.”
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    "The whole aim of practical politics is to keep the populace alarmed (and hence clamorous to be led to safety) by menacing it with an endless series of hobgoblins, all of them imaginary."
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    Dangerous Donald Neuro's Avatar
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    Re: Metal Detector Accessories

    Quote Originally Posted by osoab View Post
    We got two bots here? Why didn't you delete the op madfranks?
    I thought it was quite interesting to find out how a metal detector works.
    Cultural Marxism: -The idea that good, hard working, white people should pay for those who are not, and thus in the name of equality create the conditions for their own genetic annihilation

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    Moderator madfranks's Avatar
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    Re: Metal Detector Accessories

    Quote Originally Posted by osoab View Post
    We got two bots here? Why didn't you delete the op madfranks?
    I just deleted the link, but left the posts. Probably bots, but let’s see if they post anything else.
    "Liberty is so creative, and the government is so stupid, that I’m very optimistic about the future"
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    Unobtanium osoab's Avatar
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    Re: Metal Detector Accessories

    Quote Originally Posted by madfranks View Post
    I just deleted the link, but left the posts. Probably bots, but let’s see if they post anything else.
    Wish in one hand and ..... in another....
    “Democracy is also a form of worship. It is the worship of Jackals by Jackasses. It is the theory that the common people know what they want, and deserve to get it good and hard.”
    H.L. Mencken

    "The whole aim of practical politics is to keep the populace alarmed (and hence clamorous to be led to safety) by menacing it with an endless series of hobgoblins, all of them imaginary."
    H. L. Mencken

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