[Charge sandwich] This is the simplest example of the charge measurement. When you put some charges between two polystyren sheets, the charges stay there because polystyren is a kind of good insulation. Without voltage application, only induced charges are observed on the both electrodes due to the accumulated charges ih the middle. If you apply dc electric field from outside, surface charge quantity changes but the charges in the middle don't. |
[Induced charge due to dc bias; Q=CV]
When dc 5 kV is applied to a PS film sample, surface charges appear on the both electrodes. Electric field and potential distribution can be calculated easily from the observed charge distribution. |
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