Testing Faraday Cup for Electrostatic Charge Measurement

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A homemade Faraday cup is being tested for measuring electrostatic charge in particles from a fluidized bed reactor, but it fails to maintain voltage after disconnection from the power source, losing potential within two seconds. The user is experiencing oscillations in charge measurements when connected to a picoammeter, suggesting possible construction issues or testing errors. Questions arise regarding the cup's construction, including whether it is shielded from electromagnetic radiation and if there are any high impedance leakage paths affecting performance. Suggestions for troubleshooting include examining the integrity of the standoffs and ensuring cleanliness. The discussion highlights the challenges of accurately measuring electrostatic charge with a DIY Faraday cup.
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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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