Earth's Magnetic Field and FID...
Today I did a very simple experiment.
Materials and Equipment needed:
* Pulse Generator (0 to 10khz -or higher)
* Oscilloscope (10Mhz or better)
* Horseshoe magnet (strong ... perhaps 3 inch or so)
* Horseshoe solenoid (each coil giving opposite pole when energized)
* Longish keeper -- one that extends well beyond the magnet width
* Pick up "air" coil -- to fit nearby the longish keeper.
Place the horseshoe magnet oriented such that its back is facing north, and its left pole is north, right pole south as you face north as well.
Place the keeper across the magnet, having the left side extend leftward, and the right side right up against the south pole.
Place the horseshoe solenoid against the keeper as well.
Place the pick up coil along the axis of the keeper.
Connect the scope to the pick up coil.
Connect the pulse generator to the solenoid.
On the scope, dial in 50usec/div and the lowest AC voltage setting.
On the pulse generator, pick and amplitude mid-way and select
a frequency approx. 2Khz. Also, if your pulse generator can
do square waves, select that -- NOT sine waves or saw-tooth.
If things are working correctly, the pickup coil should be showing you
nice 2khz spikes on your scope, one going upwards (positive) and
the second one going sort of mostly downwards (negative), with
a nice associated damped oscillation afterwards. This is all normal stuff.
Now for the fun part.
Take your frequency generator and slowly dial upwards higher than 2khz,
and then also lower below 2khz.
You should observe an "echo" pulse that is NOT the same amplitude as your solenoids pulse. In fact, you can increase and decrease the amplitude of your solenoid pulse, and you will see that this does not affect the amplitude of the "echo" pulses.
Further, as you carefully increase or decrease the solenoid frequency, you should observe that these "echo" pulses will speed up scrolling BETWEEN your pulses faster and faster, or slower and slower. You can attempt to exactly match to get the "echo" pulses exactly between your pulses.
You can effect, therefore, the duty-cycle of these "echo" pulses by dialing in MORE of them between your pulses ... or LESS Of them ... down to LESS then ONE for every one of your pulses. It is "beating" in other words.
Now can this "echo" pulse be exploited for power generation?
If you selected a "beat" that gave you say 3 pulses for every 1 of your pulses ... and if you were to also use less power to get the return, utilizing the MAGNET's field, the "echo" amplitude being more than one you put in,
the pick up coils "tuned" for this 4x * 2khz frequency range will see a nice DUTY cycle that is more than what you are doing with your 2khz pulses.
If you orient the horseshoe magnet such that its back is facing WEST, and everything else turned as well, you still see the "echo" pulses, but they are lower frequency and you cannot get more of them between your pulses.
I found a paper titled "Nuclear Spins in the Earth's Magnetic Field" by P.T. Callaghan and M. Le Gros, which explains this better than I can.
https://www.google.com/url?sa=t&rct=...JgIGw3OlNLmfew
Today I did a very simple experiment.
Materials and Equipment needed:
* Pulse Generator (0 to 10khz -or higher)
* Oscilloscope (10Mhz or better)
* Horseshoe magnet (strong ... perhaps 3 inch or so)
* Horseshoe solenoid (each coil giving opposite pole when energized)
* Longish keeper -- one that extends well beyond the magnet width
* Pick up "air" coil -- to fit nearby the longish keeper.
Place the horseshoe magnet oriented such that its back is facing north, and its left pole is north, right pole south as you face north as well.
Place the keeper across the magnet, having the left side extend leftward, and the right side right up against the south pole.
Place the horseshoe solenoid against the keeper as well.
Place the pick up coil along the axis of the keeper.
Connect the scope to the pick up coil.
Connect the pulse generator to the solenoid.
On the scope, dial in 50usec/div and the lowest AC voltage setting.
On the pulse generator, pick and amplitude mid-way and select
a frequency approx. 2Khz. Also, if your pulse generator can
do square waves, select that -- NOT sine waves or saw-tooth.
If things are working correctly, the pickup coil should be showing you
nice 2khz spikes on your scope, one going upwards (positive) and
the second one going sort of mostly downwards (negative), with
a nice associated damped oscillation afterwards. This is all normal stuff.
Now for the fun part.
Take your frequency generator and slowly dial upwards higher than 2khz,
and then also lower below 2khz.
You should observe an "echo" pulse that is NOT the same amplitude as your solenoids pulse. In fact, you can increase and decrease the amplitude of your solenoid pulse, and you will see that this does not affect the amplitude of the "echo" pulses.
Further, as you carefully increase or decrease the solenoid frequency, you should observe that these "echo" pulses will speed up scrolling BETWEEN your pulses faster and faster, or slower and slower. You can attempt to exactly match to get the "echo" pulses exactly between your pulses.
You can effect, therefore, the duty-cycle of these "echo" pulses by dialing in MORE of them between your pulses ... or LESS Of them ... down to LESS then ONE for every one of your pulses. It is "beating" in other words.
Now can this "echo" pulse be exploited for power generation?
If you selected a "beat" that gave you say 3 pulses for every 1 of your pulses ... and if you were to also use less power to get the return, utilizing the MAGNET's field, the "echo" amplitude being more than one you put in,
the pick up coils "tuned" for this 4x * 2khz frequency range will see a nice DUTY cycle that is more than what you are doing with your 2khz pulses.
If you orient the horseshoe magnet such that its back is facing WEST, and everything else turned as well, you still see the "echo" pulses, but they are lower frequency and you cannot get more of them between your pulses.
I found a paper titled "Nuclear Spins in the Earth's Magnetic Field" by P.T. Callaghan and M. Le Gros, which explains this better than I can.
https://www.google.com/url?sa=t&rct=...JgIGw3OlNLmfew
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