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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well the closer the res freq of the metal object is to the magnetrons freq, of course, the more voltage... But, the arc coming from the fork would be the freq of the microwaves.
Or, are you asking what is the resonant frequency of a fork?
I experimented with things like this, using a copper wire, and i thing i found the length that resonated at the freq of the magnetron... As crazy as it sounds, this is true...
It was making plasma at first as i expected, which lasted maybe half a second. Then, the plasma seemed like it was rising and growing until the top of the cavity of the microwave was full of plasma... Then the microwave let out a bunch of smoke. All the wires connecting the MOT where dripping with molten insulation. The RFI filter board's fuse was bypassed, so the traces all over it where blown to crap :P The breaker did not trip, this was on a 30 amp circuit and it all happened within 3 seconds.
This doesn't sound right, i mean, would the resonating between the magnetron and load in the cavity cancel the leakage inductance of the MOT and cause it to suck so much power? I know that this happened, the board was (obviously) fine beforehand.
I'm more curious about the frequency of the plasma then the fork, I don't know a whole lot on the subject but wouldn't the frequency of the plasma be the same as that of the magnetron?
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
From Wikipedia:
"Microwaves are electromagnetic waves with wavelengths ranging from as long as one meter to as short as one millimeter, or equivalently, with frequencies between 300 MHz (0.3 GHz) and 300 GHz."
The currents induced in objects in a microwave are within that range. It would certainly make life interesting if you could induce that kind of power wirelessly at 60Hz, but unfortunately this is not the case...
The reason for the hum is because of the supply causing a sort of audible modulation, like the way you hear a Tesla Coil's BPS frequency even though it's resonating at ultra-sonic levels. Like PWM or FM, a frequency you can hear within a frequency you can't.
Not sure how much the resonant frequency of the spoon comes into play...
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