How metal detectors work

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  • เผยแพร่เมื่อ 23 ธ.ค. 2024

ความคิดเห็น • 25

  • @AKIOTV
    @AKIOTV  6 หลายเดือนก่อน +5

    Important detail: there's something I did not explain right. When a metal object approaches the transmitter, it does produce an opposing field, *however* the transmitter coil will experience an increase in current that compensates for this, so that the net field remains the same. Just like in a transformer: drawing more current on the output also causes more current draw on the input. For this reason, if your receicer coil was identical to your transmitter coil, and placed exactly on top of it, it would see no change in the field.
    The key then, is that the receiver coil is shaped differently, has a different size, or is placed in a different location. Although the metal object doesn't change the net field through the primary, it does change the field locally. (in other words, the shape of the magnetic field). Therefore the pickup coil needs a shift in position, a different size or a different shape.
    I did not go into the importance of the coil geometry/placement well enough in this video, and plan to do this in a revisit later on.
    Thank you for watching!

  • @fahadschannel
    @fahadschannel ปีที่แล้ว +2

    Love that you explain things without dumbing them down.

  • @nicholaslee722
    @nicholaslee722 6 หลายเดือนก่อน

    Awesome! This is the explanation I was looking for. The others that pop up in my search results just end up hinting they don't exactly know how the detectors work. I'm a technical person, the moment you mentioned signal generator, receiver and alternating magnetic field, I kind of know where it's going. Great that you even have a demonstration!

  • @peterrhodes5663
    @peterrhodes5663 6 หลายเดือนก่อน

    How does the oscillating frequency from the transmitting coil affect the function of the device? Would a frequency above human audio range be better, with the receive signal being fed through a frequency divider to enable the operator to hear?

    • @AKIOTV
      @AKIOTV  6 หลายเดือนก่อน

      It depends on the range required/the size of the objects etc what's best. Normally the lowest frequency they operate at is about 10kHz, which you could technically hear, but it's a very sharp, annoying high pitched whine, so usually, even at lower (audible) frequencies, the tone the operator hears is not the carrier signal itself but indeed something derived from it.

  • @andreserafim1256
    @andreserafim1256 11 หลายเดือนก่อน

    Awesome explanation! Made it very easy to understand... Thanks!

  • @omsingharjit
    @omsingharjit ปีที่แล้ว +2

    What if someone hide aluminium cloth in the layer of his pocket fabric to confuse and make fun of security guard 😂😂

    • @AKIOTV
      @AKIOTV  ปีที่แล้ว +4

      While it could be funny, I personally wouldn't spend any more time at airport security than necessary 😅

  • @8_Bit_Cloud
    @8_Bit_Cloud 5 หลายเดือนก่อน

    Great Video, I'm designing one a big one 800mmx400mm. Video helped a lot.

  • @sokauo
    @sokauo 7 หลายเดือนก่อน

    hi, you should have try to moove the reciever coil so it bearly pick the signal, you would have a much better sensitivity

  • @TomKolesnyk
    @TomKolesnyk หลายเดือนก่อน

    Thanks legend.

  • @stefanotthansen6769
    @stefanotthansen6769 4 หลายเดือนก่อน

    If you have a gold ring you can try using that.

  • @jimhanty8149
    @jimhanty8149 ปีที่แล้ว +1

    great vid.. thank you..

  • @MohamadFawaz-ts4qx
    @MohamadFawaz-ts4qx 6 หลายเดือนก่อน

    Thanks man !

  • @HollosySzabi
    @HollosySzabi 10 หลายเดือนก่อน +3

    Very good video, have you recived a pice of gold ? ;)

    • @AKIOTV
      @AKIOTV  10 หลายเดือนก่อน +2

      I wish haha

  • @samithetechsavvy6485
    @samithetechsavvy6485 6 หลายเดือนก่อน

    Thank you very much my friend

  • @mimano8469
    @mimano8469 ปีที่แล้ว

    great channel 👍

  • @jimhanty8149
    @jimhanty8149 ปีที่แล้ว +2

    Al U Minium... amazing... but will it work on aluminum... thats the real question.!

  • @emmavanderniet2847
    @emmavanderniet2847 ปีที่แล้ว +1

    👌🏼

  • @n5sdm
    @n5sdm 7 หลายเดือนก่อน +2

    What a horrible explanation.
    1. You demonstrated a de-tuning effect of a coil near a metal object. Not how modern two coil detectors work.
    2. You should have a second pobe on the TX coil to trigger the oscilloscope trace for the timing of the rx coil.
    3. This would allow you to null the rx coil so that the signal strength is near zero.
    4. Place metal near the coils and you could witness the signal strength and the phase change on the rx coil.
    5. This would demonstrate the ability to detect size and depth on a metal as well as its conductivity for a generalized identification of metal and size/depth.
    keep learning.

  • @SanjabarRogers
    @SanjabarRogers 6 หลายเดือนก่อน

    Your explanation is way too technical. I give your video a thumbs down .

    • @coal9836
      @coal9836 4 หลายเดือนก่อน

      Duck

  • @MohamadFawaz-ts4qx
    @MohamadFawaz-ts4qx 6 หลายเดือนก่อน

    Thanks man !