Rapid Coils
Angelika
More than 1200 different RF coil designs in more than 30 countries all over the world, more than 20 years of thorough experience in designing and producing volume resonators, surface coils and phased arrays from low field to 9.4 T UHF human and 21 T pre-clinical scanners, non-proton solutions including 11 different nuclei with up to 32 channels, compatibility with major MR systems, customized coils with Medical Device approval, interventional head coils, PET compatible MR coils designed and manufactured in Germany.
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Over the last 30 years, there have been dramatic changes in phased array coil technology leading to increasing channel density and parallel imaging functionality. Current receiver array coils are rigid and often mismatched to patient's size. Recently there has been a move towards flexible coil technology, which is more conformal to the human anatomy. Despite the advances of so-called flexible surface coil arrays, these coils are still relatively rigid and limited in terms of design conformability, compromising signal-to-noise ratio (SNR) for flexibility, and are not designed for optimum parallel imaging performance. The purpose of this study is to report on the development and characterization of a 15-channel flexible foot and ankle coil, rapidly designed and constructed using highly decoupled radio-frequency (RF) coil elements. Coil performance was evaluated by performing SNR and g-factor measurements. In vivo testing was performed in a healthy volunteer using both the 15-channel coil and a commercially available 8-channel foot coil. The highly decoupled elements used in this design allow for extremely rapid development and prototyping of application-specific coils for different patient sizes (adult vs child) with minimal additional design consideration in terms of coil overlap and geometry. Image quality was comparable to a commercially available RF coil.
In the study, the Nume coil demonstrated 91.2% successful long-term occlusion at 6 months and comparable mortality and serious adverse events. These results are particularly noteworthy because the Numen coils are generally longer and may need fewer coils to achieve the same packing density, stated Rapid Medical.
A coil gun works by using electromagnetism to accelerate a projectile. The gun consists of a series of coils that are powered by electricity from a battery. When the coils are energized, they create a magnetic field that pulls the projectile through the barrel of the gun at high speeds.
While it is possible to use various types of batteries for a coil gun, using lithium car batteries is recommended for their high capacity and ability to deliver large amounts of current. This allows for rapid firing and high velocity of the projectile.
Yes, it is important to take proper safety precautions when working with high voltage and high current devices. Make sure to wear protective gear and handle the batteries carefully to avoid electrocution or other accidents.
The materials needed include a power source (lithium car batteries), a capacitor bank, a series of coils, a trigger switch, and a projectile. You may also need a power supply, charging circuit, and other electronic components depending on the design of your coil gun.
The legality of owning and operating a coil gun varies by location. It is important to research and comply with any laws or regulations in your area before building and using a coil gun. Additionally, always use caution and follow proper safety measures when operating a coil gun.
Hi all. I am considering making a rapid-firing coil gun for a school project. NO it will not be a gigantic man-slaughtering weapon of mass destruction - I doubt whether it will even break the sound barrier (more like dropping like a stone after travelling 2 feet). Honestly, I'm happy if I get the projectile out a meter before it hits the ground.
So, can anyone suggest some ideas or plans or sites to help me? I've googled around, but they all are either camera flash cap powered or gigantic cap more than capable to kill a person powered. And they're all one shot, then wait for the cap to recharge style. Are there any rapid fire ones? I saw a few movies of a very low power but rapidfiring coilgun. It was awesome.
So, should I go around messing with caps? One thing is certain, a cap-powered coilgun will NOT give me rapid firing abilities. So, should I build a slow-firing cap coilgun, or a rapid firing battery coil gun? I am leaning towards the latter, but then, where can I get a 12v battery with an appreciable amount of current?
Well, thanks everybody. I've decided against the coil gun because our teacher absolutely refuses to allow me to have even a few hundred volts built up across the circuit. So, I'm just gonna do a much safer Gauss Rifle! Basically its a bunch of magnets spaced out on a wooden stick (120 cm in my case, yea!), and 2 steel balls in front of each magnet. When a steel ball is attracted to the first magnet, it will transfer its energy, push the 2nd steel ball in front of the magnet, which will hit the magnet in front of it, and transfer its energy, and so on, so the device is accelerating and at last, the final steel ball will burst through the muzzle.
Use electromagnets and a series of switches that can also be run in reverse, which would allow you to move the balls back to their original position (with a bit of fancy switching) without actually touching them.
That's a good idea, and I've thought about it. However, how can I make the electromagnets as strong, if not stronger, as a neodymium magnet? That's what I'm worrying about, because I DON'T think I'll have an AC supply.
Yea I've thought of that too . I thought of a manual one, so each magnet will have a little thin plate sticking out behind it. So when the ball hits the plate, the energy will be transferred, but I can have a handle on the side and I'll pull it back using manual force. Is that what you're suggesting as well?
Just use a halbach array. I've used the principle behind a gauss rifle to develop (unfortunately, not create) an electric-powered paintball gun. The trick is getting the return mechanism right (and, in the case of paintball, the loading mechanism).
I've seen your design on the electromagnetic gauss gun paint ball shooter thing that you were discussing with D22k, calbiterol. However, I have just about 4 or 5 days to build this thing before handing it in, and how much time would it take to wrap about 100 electromagnets? They're too weak - I only have a maximum power source of 9V batteries.
To be honest, the easiest way to wrap nearly-perfect coils is with a power drill. For example, grip a nail with the drill, duct tape the end of the wire to the nail, and SLOWLY (that's the key this is where multispeed locking drills are amazing) wind the coil. Speed-wise, I don't know. I don't remember, however, if the design I put up here @ sci forums was the EM one or the halbach array one. Either way, it should work.
Thanks calbiterol. For the project I'm handing in I'll just build a magnetic gauss rifle, instead of the automatic, because I don't think I'll have enough time for it. However, I will make the automatic Gauss rifle! Probably during spring break, summer, or some other long weekend. I have lots of 3 meter long square lumbers (like the sticks for holding up signposts and stuff) lying around my school's wood shop and I can cut a section using the table saw and dig a groove in it using the milling machine, then work on the electromagnetic one!
Cheapest way to get pseudo-ball bearings that work is to buy steel "slingshot ammunition." It's identical in every respect to ball bearings except precision (a lot less perfect of a sphere) and price (immensely cheaper).
Well, that's the problem. I can't find steel balls anywhere. I've asked for everything: steel balls, ball bearings, steel marbles, steel BBs, steel pellets, you name it. I've went to every shop I can find - hardware shops, Home Depot, craft shops, auto parts shops... Basically, I can't find a sphere that is made of metal. .
Incidentally, yesterday I built a very crude coin launcher on my dining table. I had 3 stages only, but it worked, and the penny was launched off the table. It wasn't very far - think it was 5 inches. But I used coins lying flat on the table, and obviously it was very crudely done - did it in about a minute.
I'm thinking of a launching mechanism for the Gauss Rifle, one that I can control from a distance through a wire. I'm thinking of an electromagnet controlling a little "gate" which blocks the first ball, and when I press the switch the gate is attracted upwards, letting the ball roll to the first magnet. However, are there ay other ways to create a launching mechanism?
Yep. Pneumatics. Otherwise known as an air cannon. PVC, a spare bike tire nipple, and a bike tire pump, connected to a ball valve and something to launch the bearing. This setup gives you a lot more oomf than normal, for two reasons. First, the magnet doesn't have to overcome static friction, and two, the first bearing has added momentum to give to the next ball.
The ball was slooooooow. It had 10 stages and the exitting ball is so slow that you could stick your hand in its way and feel absolutely nothing and the ball will just slide off your hand. I can barely feel it hitting my hand. And instead of everything happening at once and you hearing an almost uniform loud clink when the thing fires, mine you could track the sounds as it went clink-clink-clink-clink. I am pretty sure that I have optimal spacing - 6cm, as any closer would send the ball hurtling towards the magnet in front of it prematurely. I estimate that I could have placed just one other ball bearing in front of each group of 2 balls. That was my spacing. The ball just made pass my table and fell like a stone. All very fast of course.
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