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piezo vibration sensor
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--- Quote from: Zero999 on September 11, 2019, 03:33:37 pm ---What do you mean by depolarised?
--- End quote ---
I can't speak to the physics exactly, but I have re-polarized piezo crystals a few times before.
(Piezo servoes with a feedback section.)

https://www.comsol.com/blogs/piezoelectric-materials-crystal-orientation-poling-direction/

Consider this, a piezo crystal with two faces, two wires.
You hit it with a hammer, which wire should be positive if a piezo crystal was entirely uniform?

It's like magnetizing something. Put it in a strong field, hopefully some of the "polarization" remains when you remove the field.
Heating above the Curie point kills both magnetism in materials and piezo polarization.
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