Githin
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I am designing a capacitor with low noise and high stability. The dielectric needs to be compressible - so that I can measure a pressure on the plate as a function of capacitance. I tried making a simple capacitor with copper foils as anode and cathode and polyurethane foam as dielectric and found it very noisy.
I can't figure out what causes the noise. It is not probably because of vibrations. What else in the system can cause noise? I measured the noise in the measurement on a standard capacitor and it is about 30aF RMS. With the capacitor I made, the noise in the measured value is about 300fF (about 10000 times higher). There is something in my simple capacitor that makes it inherently noisy. What can I do about it?
I can't figure out what causes the noise. It is not probably because of vibrations. What else in the system can cause noise? I measured the noise in the measurement on a standard capacitor and it is about 30aF RMS. With the capacitor I made, the noise in the measured value is about 300fF (about 10000 times higher). There is something in my simple capacitor that makes it inherently noisy. What can I do about it?