A capacitively based MEMS affinity glucose sensor.
link to the IEEE paper, from where I've got this doubt.
The gold electrodes are separated with some distance and the permalloy is vibrating with the help of solenoid(it generates a time-varying magnetic field[solenoid is not shown in the image]). Glucose comes inside through the semipermeable membrane and makes the liquid in which the cantilever is there more viscous which reduces the vibration in the cantilever. We measure the capacitance created by the gold electrode.
Question: How does the capacitance changes when the vibration of the permalloy slows down?