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Controlled grid corona charging apparatus

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Contact details

Droppert, P.J.
Applied Sciences (TNW), DelftChemTech, Polymer Materials and Engineering
Julianalaan 136, 2628 BL Delft
Tel : +31 (0)15 27 82735
E-mail : P.J.Droppert@tudelft.nl
Website : Open website

General Information


Controlled grid corona charging apparatus


Room 0.305, Faculty of Applied Sciences, Julianalaan 136, 2628 BL Delft

Key words:

electrostatic, grid, teflon, electret, high voltage, charging, Corona

Main application:

Electric charging of metallized plastic foil.


This setup was used in the developement of the electret microphone. The electret is basically an insulating material with 'frozen-in' polarization, resulting in a permanently electrified material - the electrostatic analogue of a permanent magnet. This permanent 'frozen-in' surface charge, or homocharge, can be exploited in many ways, the most widely used device being the electret microphone.

Instrument specification

Max potential difference:
approximately 1 kV