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Author Topic: Magnetic 'Lens'  (Read 31745 times)

tuckbone

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Magnetic 'Lens'
« on: December 16, 2010, 09:11:31 AM »
First post, so take it easy on me!  :P

I was reading up on Electron Microscopes, and read about the way they direct the electrons is through a magnetic lens of sorts. The magnetic force drives the electrons through a small gap, blah blah..

any body have any thoughts on focusing the magnetic field instead? sort of taking the field and condensing it, so that it's stronger or more condensed? Like focusing light down to make it brighter?

Just a thought..

truesearch

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Re: Magnetic 'Lens'
« Reply #1 on: December 16, 2010, 10:45:38 PM »
By "focusing" the magnetic field would this have the same effect as "shielding"??

truesearch

DreamThinkBuild

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Re: Magnetic 'Lens'
« Reply #2 on: December 17, 2010, 12:33:23 AM »
Hi Truesearch,

Welcome to the forum.

Hi Jerry,

I built patent #5929732 last year. It's a really interesting device. If you take a square magnet and run it over the beam area you will notice a push in the middle. A larger steel ball will make a larger (dome like) falloff of the beam. A small steel ball beam will make the beam narrower (pinpoint).

The magnets are pretty weak and it still put out a good beam. I wrapped a coil around the top magnet and pulsed it with a square wave into a air core coil it does pickup the signal, about a half foot away, on the scope. I was thinking of removing the top magnet and putting a iron core with a control coil to see if I could make a pulsed magnetic switch but never got back to it, so many projects, so little time.

If you could either focus or reflect magnetic fields then you could create a magnetic motor. From all my experimenting I haven't found a way yet.

Here are some pics of it.

truesearch

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Re: Magnetic 'Lens'
« Reply #3 on: December 17, 2010, 05:11:49 PM »
@DreamThinkBuild

That is a nice looking concept build!

I'm trying to understand what the flux "field" or "map" would look like with this magnetic lens/beam. Got any ideas?

truesearch

truesearch

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Re: Magnetic 'Lens'
« Reply #4 on: December 17, 2010, 09:11:20 PM »
@DreamThinkBuild:

How "tight" or "focused" is this magnetic beam?

I was wondering if something like this rough diagram might work. It's simply a wheel with magnets situated around the edge at an angle so that the magnetic "beam" would push against the face of those magnets for rotational movement.

truesearch

DreamThinkBuild

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Re: Magnetic 'Lens'
« Reply #5 on: December 18, 2010, 12:54:53 AM »
Hi Truesearch & Jerry,

I can only get a rough estimate of what the flux map feels like by dragging a flat magnet over the top. A large sphere will create a dome like beam and a smaller sphere will be tighter. There is a falloff it's not like a laser beam. Six inches was the falloff of this but the signal to the air core coil was weak.

The smaller the sphere the harder the challenge in getting the magnets to cooperate. You need, like in the patent, to have metal shafts or bolts so the magnets are away from each other but still linked to the sphere. If they are too close the magnets want to twist and snap together which provides many hours of enjoyable fun. :)

In your picture of the wheel you may need shielding on the edges of the magnet. When I take the flat magnet and place it anywhere near the edges it wants to snap down to the south sides of control magnets.

I drew a picture to show what the beam looks like this is just from passing a flat magnet over the beam area. The outer edges attract as you get to the center you can feel a noticeable push/repel up on the magnet. As for stretching I'm not sure, maybe with another ring of magnets around the beam area you could make a focus control.

truesearch

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Re: Magnetic 'Lens'
« Reply #6 on: December 20, 2010, 06:02:30 PM »
@DreamThinkBuild and @Jerry:

After seeing what you've posted and getting a little better grasp of the "possible" flux field/lines I wonder if the following magnetic "wheel" would potentially work. Look it over and see what you think.

truesearch

tak22

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Re: Magnetic 'Lens'
« Reply #7 on: December 20, 2010, 07:33:31 PM »
@DreamThinkBuild

A couple questions if you don't mind.

1. The patent makes no mention of what the focus sphere is made of, but it does say the connecting
bolts are nonferric. Have you tried a nonferric object to see if there is a difference?

2. If a ferric focal point works best, which works better, a sphere or a block?

thanks for any thoughts to these,

tak

FatBird

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Re: Magnetic 'Lens'
« Reply #8 on: December 20, 2010, 08:14:07 PM »
Why go thru all that work? 

Just get an old CRT PC Monitor & bust the neck part off the CRT.

Presto, you have an Electron Beam Gun, all FOCUSED & READY TO GO.

.

neptune

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Re: Magnetic 'Lens'
« Reply #9 on: December 20, 2010, 08:44:05 PM »
@Fatbird . I am not sure that a magnetic beam and an electron beam are the same thing . Also once the tube looses its vacuum , the cathode heater [filament] would burn out if energised .Nice idea for all that .

kampen

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FEMRADD Generator
« Reply #10 on: December 20, 2010, 10:12:48 PM »
@ All,

Any NEWS and/or updates on this device?

truesearch

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Re: Magnetic 'Lens'
« Reply #11 on: December 20, 2010, 10:30:34 PM »
To all:

Anyone involved here good with FEMM-4.2 or some other "magnetic-simulation" software? Maybe we could get an idea about the potential of the magnetic-beam.

I'm not any good with it yet. . . . .  ???

truesearch

armagdn03

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Re: Magnetic 'Lens'
« Reply #12 on: December 21, 2010, 12:43:44 AM »
Patent #5929732 shows a focusing assembly for making a magnetic beam.  The claim is that when focused in this way a small magnet's field will have an effect on the colors of a monitor's screen from a distance of a few feet.  It's also claimed that the focused beam can transmit electrical power.

Mr. Volland.....

 ;D great  find. I will elaborate on this back at our heretical place.

truesearch

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Re: Magnetic 'Lens'
« Reply #13 on: December 21, 2010, 04:43:46 PM »
@Jerry:

I think that there is only 1 "sticky" spot in this arrangement (see following picture) and it appears like there would be sufficient "push" to get past it. However, I don't know how to calculate or simulate the experiment with the software I have.

truesearch

armagdn03

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Re: Magnetic 'Lens'
« Reply #14 on: December 21, 2010, 06:12:54 PM »
I am running a magnetic simulation as we speak, however I do not believe that the the "graph" that has been shown is correct, ill post results and pictures when done,

the key aspect of this is variation from the inverse cube law with respect to the "beam"