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High Voltage Excitation of Piezo Crystal?
Рет қаралды 1,651
Күн бұрынSome wacky behavior we observed recently. What is going on here? Let me know if you know. There is clearly some level of voltage multiplication going on here.
@AdamBechtol 6 ай бұрын
"....gonna fall off the table" -"Yes" haha
@Spirit532 2 жыл бұрын
This is happening due to the fact that the piezo crystal is a capacitive device, and the HV PSU is charging it up through the air before arcing, using its ignition voltage(which is higher than the steady state voltage), in addition to having much sharper edges, which lead to higher charge concentrations and more air ionization. Try the same with a high voltage capacitor, and you'll see the exact same results.
@jozefnovak7750 4 ай бұрын
Super.
@cnxunuo 2 жыл бұрын
HeNe psu gives open circuit ignition voltage a lot higher than 1.5kv, this looks like about 10kv
@bobdole27 Жыл бұрын
Ah I see now, and how can someone get one of these larger piezo crystals since I hear the smaller ones normally found will just crack when exposed to high voltage
@Buzzhumma Жыл бұрын
Hmmm why dat ? Does it act as a capacitor and change to lower frequency and greater energy dump ?
@votedthewave 2 жыл бұрын
spicy!
@cylosgarage 2 жыл бұрын
C H A D T H O N Y
@asingleoat 2 жыл бұрын
I suspect what's happening is that you are exciting a resonance in the material (similar to how an electromagnetic buzzer fires over and over again), which is causing extremely large strains in the crystal, and consequently very high voltages. Lookup "piezoelectric transformer" for a deliberate designed use of the phenomenon
@NIOC630 2 жыл бұрын
Not really, if you look closely, the angry arc is just between the sides of the crystal, the other arc is still very tame. All this is is the quite large capacitance of the crystal, its essentially a high voltage ceramic cap with a spark gap attached.
@asingleoat 2 жыл бұрын
@@NIOC630 if it is acting as a piezoelectric transformer, it's no surprise that the large arc is not where the applied voltage is. the large arc is occurring across the open 'secondary' of the transformer
@NIOC630 2 жыл бұрын
@@asingleoat But its not larger.
@asingleoat 2 жыл бұрын
@@NIOC630 you might be right! it might not actually be a higher voltage/larger arc. I still think it is acting as a resonant piezoelectric transformer with an open secondary, or at least that that is a useful frame of analysis
@matthewellis3004 2 жыл бұрын
pop a popcorn kernel
Theoria Apophasis
Рет қаралды 64 М.