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Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Wow, that was interesting. I found the same thing once in a completely different apparatus. I made a hammered dulcimer with 12 sets of strings, 3 strings per set strung across a bridge adjusted for the fifth. While messing around with the tuning of it once, I set all the strings to one note. The thing began to hum with the slightest tap. It would get louder too, like it was singing with more energy than I had put into it. Kinda scared me actually, I thought it was going to break and quickly detuned it.
Edit. Just had thought, if you had a number of electromagnetic resonant coils, could it make an 'elctromagnetic laser'? (To test the mathematics.) Where the motors are vibrating through the plate, instead the resonators could vibrate through....what does EM travel through? the vacuum I guess, that's in the equation as the medium of transmission (permittivity and permiability of free space). A vacuum waveguide would then be necessary. Wow. again.
Registered Member #1334
Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615
I wonder if this effect is analogous to the phenomenon observed by clock makers over the centuries whereby if two or more pendulum clocks (e.g. Grandfather Clocks) are placed in the same room (on the same floor without mechanical isolation), their ticking/swing will eventually synchronise? (and in some cases, all the clocks stop!)
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yes, I believe all of these things are forms of entrainment (discovered by Huygens in 1666)
Entrainment was used in electronics for syncing oscillators and frequency division, before the PLL was invented.
Coronafix: Entrainment needs non-linearities to work. It won't work with the coils because they are linear. You'll just get frequency splitting instead. The closest thing to your electromagnetic laser is a Tesla coil.
If you want an electronic demonstration, make a whole load of neon lamp flashers all running off the same poorly decoupled supply, they should synchronise just like Nicko's (or Huygens') clocks.
In a laser, the quantum effects are what provide the non-linearity. (An excited atom has a threshold: it needs a bash of a certain size to stimulate its decay.)
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Nicko wrote ...
I wonder if this effect is analogous to the phenomenon observed by clock makers over the centuries whereby if two or more pendulum clocks (e.g. Grandfather Clocks) are placed in the same room (on the same floor without mechanical isolation), their ticking/swing will eventually synchronise? (and in some cases, all the clocks stop!)
Chaotic oscillators were all the rage in the 1990s - you couldn't go anywhere without meeting someone trying to nudge two wretched circuits into synchrony.
Googling chaotic oscillator synchronization will exhume a trove of them.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Proud Mary and Steve McConnor raise valid points, Ive seen people try to claim analogus functions like a "sound laser" or "electrical beaming" or "mechanical sympathetic organization". But many of these claims are fairly unsupported, and the math in some cases seems to contradict the given explanation.
Some of these devices are interesting as a idea, academic pursuit, but there is no need to claim revolutionary explanations or over hype their significance.
EDIT: the LRAD is one of the few devices that I really like, is practical and sort of like a laser for sound, in so far as the constructive destructive wave interference and so on.
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Sonic lasers
