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Re: Current distribution in resonators
Hi,
Love your bulb and LED coil. I have thought how fine the wire would need to
be to see a wave move down a coil.
The close proximity of the driving coil must make a major change compared to
a long coil.
Regards Bob (a waveophile)
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: 20 April 2000 09:38
Subject: Current distribution in resonators
>Original Poster: gbyrd-at-aros-dot-net
>
>Hi All,
>
>In the photos referenced below I am showing the results of experiments I
>have performed to show the average current in different parts of the
>resonator. These experiments are very simple and give a good visual affect
>of what the standing wave looks like. I think Terry has been doing some
>very nice work with optically coupled current sensors (correct me if I'm
>wrong Terry), which may give better information than judging the brightness
>of a lamp. The lamp experiment gives a very good feel as to what is going
>on though, especially if they are viewed real time while the frequency is
>changed a bit.
>
>The first photo shows 11 incandescent lamps placed along the resonator to
>show the average current at that particular spot.
>
>http://www.aros-dot-net/~gbyrd/tesla/lamps.jpg
>
>For some funny reason the lamp at the bottom of the resonator does not look
>as bright as the lamps just above it? The lamps are a type 7387, 28 volts -at-
>40 ma. A lamp is non-linear, so current value is hard to judge just by
>looking at brightness. Even with the lamp experiment, I can't help thinking
>it resonates exactly as a lumped circuit. The TOTAL energy is continually
>changing from capacitive energy into inductive energy, and vice verse,
>every 1/4 cycle. The LED experimant can be seen here:
>
>http://www.aros-dot-net/~gbyrd/tesla/leds.jpg
>
>The LED experiment is quite interesting. Even with no top load, except a
>small screw, the LED at the very top of the coil is glowing some! The LED's
>indicate the current (standing wave) is alsmost linear. Lumped circuit? For
>all practical purposes, YES! A lumped component like a capacitor, when
>combined with an inductor, can cause a reflection property similar to a
>reflection from an open circuit in a transmission line.
>
>The ratio of length to diameter in this coil is close to 1:1. I think if
>the highth is much greater than the diameter, the theoretical 1/4 sine wave
>shape suggested by transmission line theory may start to show.
>
>Have fun, Duane
>
>
>