The question is a bit vague. What I understand is that you need to measure a voltage via a capacitor. It may for instance be that you want to measure the high voltage of an electrostatic charging process, or that you want to measure millivolt AC pulses. So, to help you solve the question more information is needed.
What do you mean with the term voltage sensor block (type, manufacturer)?
What is the voltage range that you need to measure?
Two researchers have now bothered looking into your question, trying to help you. No offense intended, but please either clarify your problem or withdraw it. This great Research Gate Q&A feature only florishes if pollution is prevented. Again: No offence intended, only goodwill to maybe help you further.