Testing Faraday Cup for Electrostatic Charge Measurement

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SUMMARY

The discussion centers on the challenges faced by Chris while testing a self-constructed Faraday cup for measuring electrostatic charge in a fluidized bed reactor. Chris applied a voltage of 1.5 V but observed that the cup lost its potential within two seconds after disconnecting the voltage source, questioning its performance akin to a capacitor. Additionally, when measuring particle charge with a picoammeter, he noted oscillations around zero, suggesting potential construction flaws or testing errors. The conversation emphasizes the importance of proper construction and shielding against electromagnetic radiation.

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  • Knowledge of electrostatic charge measurement techniques
  • Familiarity with picoammeter usage and calibration
  • Basic principles of electromagnetic shielding
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Weiber
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Hello everyone. I am trying to use a Faraday cup constructed by myself to measure the electrostatic charge presence in particles of a fluidized bed reactor. I am trying to test if it works properly but I am having some problems.

I am tried to apply a voltage of 1.5 V till I obtain that voltage between the layers of the cup and then disconnecting it to see if it maintains that potential during some time, but when I disconnect the voltage source it looses the potential in like 2 seconds. Shouldn't it conserve the potential like a capacitor?

I have tried to measure the charge of particles connecting the faraday cup to a picoammeter, but when I collect the particles inside I obtain oscillations over and under the zero. Maybe it is not correctly constructed or I am testing it wrong.

Thank you so much for your attention. Regards!
 
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It would be useful to know how it's constructed, is it shielded against EM radiation? Could there be a high impedance leakage path between the plates (could be grease/dirt on standoffs etc.)

-Chris
 

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