Author Topic: Resonant LC with signal generator to heat mercury  (Read 489 times)

Offline klugesmith

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Resonant LC with signal generator to heat mercury
« on: March 16, 2023, 03:53:17 AM »
Here is a new branch of the experiments reported in thread: https://highvoltageforum.net/index.php?topic=2299.0

We had characterized a small LC tank circuit, using a bench-top signal generator as power source.
Theoretical maximum power is around 1/2 watt into 50 ohms.

Let's try heating a thermometer.   I had not previously seen that done by induction.
Mercury should be easy, only 1.8% as conductive as copper, even though Hg is not ferromagnetic.  (Chart includes nickel to represent a ferromagnetic element.)


Coil is 26 AWG magnet wire on plastic tube from a ball-point pen.


Estimated inductance was about 2 uH.  First run was with a capacitor measured to be 0.333 uF, resonating at 186 kHz.
To better match the signal source impedance, I reduced C to 0.230 uF and then to 0.099 uF, which resonated at 340 kHz.
That slightly increased the indicated heating rate, to about 0.5 degree per second.  I cluttered youtube with a video.

These charts show voltage measurements with empty coil (blue) and with thermometer bulb in the middle (orange).


/>
« Last Edit: March 16, 2023, 03:55:21 AM by klugesmith »

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Resonant LC with signal generator to heat mercury
« on: March 16, 2023, 03:53:17 AM »

 


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