Ultra-fast dual capacitor high pressure sensor

I’ve been thinking about creating my own high pressure sensor, simply because the weight of commercial high pressure sensors is too large to be practical for the bike shock “chamber” I’m creating. I was going to build a capacitive sensor based on the idea that at high pressures the permittivity of air varies not insignificantly. My main concern there is current fluctuation over tiny time intervals. This might kill the idea, since I need capacitance readings +/- 20% over 20-50 millisecond intervals. This may be too short. So I’ve come up with something different I’d like to pass by you. It would be a circuit measuring differential current between two capacitors. It would essentially be measuring the magnitude of fluctuation of current. I think this could work well to at least measure pressure gradients accurately.

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Ultra-fast dual capacitor high pressure sensor