help : capacitance to voltage transformation circuit

[antew]

voltage transformation

i'm doing a project on liquid level sensing and i have chosen to use capacitive liquid level sensing in which i have to change the variation of capacitance in to voltage.
so i want a capacitance to voltage transformation circuit.please help if u know one!
plz plz ur help means a lot!

 

[karim365]

capacitance to voltage

hi
u need a integrator switched capacitor and sigma delta feedback
looking this paper

 

[FvM]

capacitive electronic voltage sensor circuit

Typically, the problem with capacitive level sensing applications is rather interference suppression than high resolution. Thus a simple capacitive voltage divider with a synchrone rectifier for the sense signal and possibly an additional bandpass filter should be first choice to my opinion.