This paper introduces a new way to detect charge using MEMS variable capacitors for extremely sensitive, room temperature electrometry. It is largely based on the electrometers introduced by Riehl et al.  except variable capacitance is created by a changing area, not a changing gap. The new scheme will improve MEMS electrometers by eliminating the effects of squeeze-film damping and by theoretically increasing the maximum charge resolution by 70%. The charge conversion gain (the increase in output voltage per input unit charge) for this system is derived. The result show good agreement with MATLAB calculations.
Proceedings (ISSN: 2504-3900)
Underwood, G., & Laurvick, T. (2018). MEMS Variable Area Capacitor for Room Temperature Electrometry. Proceedings, 2(13), 1075. https://doi.org/10.3390/proceedings2131075