A parallel plate capacitive sensor measures displacement. In one test the sensor has a time constant of 60 ms in air with standard temperature and pressure. • When it is subject to a displacement of 100 microns, in 80 ms what is its measured displacement? • If the initial separation between plates is 120 microns, what is the ratio of the change in capacitance to initial capacitance at 80 ms?

A parallel plate capacitive sensor measures displacement. In one test the sensor has a time constant of 60 ms in air with standard temperature and pressure. • When it is subject to a displacement of 100 microns, in 80 ms what is its measured displacement? • If the initial separation between plates is 120 microns, what is the ratio of the change in capacitance to initial capacitance at 80 ms?