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Dual Field Pi Coils

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  • Aziz
    replied
    Hi Stefan,

    Originally posted by MagnetMan View Post
    Aziz, really cool visualizations!
    thanks, it was a long way to achieve this. The coil software is written by me. I am adding as many functionality as I need. I am not giving the coil software away to ensure that coil improvements will be shared in the public domain.

    Originally posted by MagnetMan View Post
    Interesting that the triple coils appear to have a "cold" spot between the two outer coils. It's too bad there isn't a way to reflect a magnetic field so that less energy is expended on the upper side of the coils.
    This "cold" spot does not matter. The coil housing won't allow targets to come too close the coil. The one sided exitation of magnetic fields isn't possible.

    Originally posted by MagnetMan View Post
    Have you tried simulating other shapes that are asymmetrical along the z-axis such as cones?
    This wouldn't make much sense or get some benefit.

    Aziz

    Leave a comment:


  • MagnetMan
    replied
    Aziz, really cool visualizations! Interesting that the triple coils appear to have a "cold" spot between the two outer coils. It's too bad there isn't a way to reflect a magnetic field so that less energy is expended on the upper side of the coils. Have you tried simulating other shapes that are asymmetrical along the z-axis such as cones?

    I'm new to the forum, so I'm curious about the software you use, too!

    -Stefan

    Leave a comment:


  • Tinkerer
    replied
    Thanks Aziz,
    These are excellent visualizations.

    Tinkerer

    Leave a comment:


  • Aziz
    replied
    finally

    finally
    Attached Files

    Leave a comment:


  • Aziz
    replied
    to be continued..

    to be continued..
    Attached Files

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  • Aziz
    replied
    to be continued...

    to be continued...
    Attached Files

    Leave a comment:


  • Aziz
    replied
    Magnetic Field Strength Cross-Section Pictures

    Hello friends,

    is anybody interested on the magnetic field strength (MF) pictures of the compared coil configurations?

    I am sure, you will be.
    Ok, eat this.

    All pictures have the same 3D projection parameters. The x-axis is not shown (going from your eyes into your display). The y-axis shows the longest coil dimension. The z-axis the height/depth above/below coil. The small target is still placed at z=10 cm (can you see it?). The axis length is 40 cm (going from -40 cm .. +40 cm). It is divided every 2 cm for a better comparision. So you can orient at it.

    16 MF pictures will follow now ...

    Have fun,

    Aziz
    Attached Files

    Leave a comment:


  • Aziz
    replied
    Hi Ian,

    Originally posted by IBGold View Post
    Hi Aziz,
    Here is a picture of my 28 x18/15 x 10 Duel-Field and I concur with Peter on the performance.
    Regards,Ian.
    http://i806.photobucket.com/albums/y...lFieldCoil.jpg
    it's looking very very nice. It's a marvellous craftsmanship.
    Aziz

    Leave a comment:


  • IBGold
    replied
    Hi Aziz,
    Here is a picture of my 28 x18/15 x 10 Duel-Field and I concur with Peter on the performance.
    Regards,Ian.
    http://i806.photobucket.com/albums/y...lFieldCoil.jpg

    Leave a comment:


  • Aziz
    replied
    Hi detectormods,

    Originally posted by detectormods View Post
    Hi Aziz,

    Back from Gold field tests.

    Real tests in the field show that the noise does NOT INCREASE with a split winding. This is different to my bench testing on a bed of hot rocks, if anything the dual field coil was quieter than one with a diameter of the largest winding.
    thanks for your valuable feedback and field tests. This is indeed a good news. One could make a 0.67R and 1R split coil for more hotter grounds. This should even be more quiet. Then quite big coils (18"+) could be used in the field with the benefit of sensitivity to small targets too. The high sensitivity in the near detection zone can not be fully used due to some distance of the coil to the ground.

    Aziz

    Leave a comment:


  • detectormods
    replied
    Hi Aziz,

    Back from Gold field tests.

    Real tests in the field show that the noise does NOT INCREASE with a split winding. This is different to my bench testing on a bed of hot rocks, if anything the dual field coil was quieter than one with a diameter of the largest winding.

    Leave a comment:


  • Aziz
    replied
    Hi Rov,

    Originally posted by Rov View Post
    Hi Aziz,in your graph softwares what do the graduations for X-Y (horizontal to vertical) mean too people that dont know an want to interpret simply?you do not have reference to scales for people to follow.Thanks!
    x-axis: target distance in cm from the center position of the coil arrangement
    y-axis: induced voltage from the secondary magnetic fields (target's eddy current caused magnetic field)

    The absolute value of the induced voltage is not important. Only the relation to the other coils or configurations. As all the configurations are normalized to a particular specification, one can compare different coil configurations together. It's just tells, how an equivalent coil configuration compares to other equivalent configurations.

    If I do not normalize, then it would be difficult to say, whether a configuration performs better or not.

    All coil configurations are normalized to L=300µH (total coil inductivity) and 500 cm² coil flux area (coil coverage area). This means, all configurations will emit same magnetic field energy to the target.


    Aziz

    Leave a comment:


  • Rov
    replied
    Hi Aziz,in your graph softwares what do the graduations for X-Y (horizontal to vertical) mean too people that dont know an want to interpret simply?you do not have reference to scales for people to follow.Thanks!

    Leave a comment:


  • Aziz
    replied
    Dual Field Coil Turn Variations

    This is the Dual Field 0.5 coil, where the turn ratio of the inner to outer windings are varied (see below).

    Syntax:
    N=inner:outer windings turn ratio

    N=1:3 means, the outer coil winding turns has 3 times more windings than the inner coil
    N=3:1 means, the inner coil winding turns has 3 times more windings than the outer coil

    All variations have the same inductance L and same coil flux area of 500 cm² (outer coil).

    Aziz
    Attached Files

    Leave a comment:


  • Aziz
    replied
    Further Dual Field Coil Analysis

    Hi all,

    I want to show you, how the Dual Field coil behaves to different size targets. And how the Dual Field coil compares to other coil types (see below).
    T=10: 10 mm target diameter
    T=20: 20 mm target diameter
    T=40: 40 mm target diameter

    Aziz
    Attached Files

    Leave a comment:

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