A RESONANT TUNING FORK FORCE SENSOR WITH UNPRECEDENTED COMBINATION OF RESOLUTION AND RANGE


Azgin K. , Ro C., Torrents A., Akin T. , Valdevit L.

24th IEEE International Conference on Micro Electro Mechanical Systems (MEMS), Cancun, Mexico, 23 - 27 January 2011, pp.545-548 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1109/memsys.2011.5734482
  • City: Cancun
  • Country: Mexico
  • Page Numbers: pp.545-548

Abstract

This paper presents a double-ended tuning fork (DETF) force sensor with a resolution of 7nN and a range of 0.12N. The resonator has a scale factor of 216 kHz/N, a Q-factor exceeding 60,000 at 3mTorr ambient pressure and a zero-load resonant frequency of 47.6 kHz. The sensor and the complete readout circuit are fully embedded in a compact 65 mm x 52 mm printed circuit board (PCB). The PCB is mounted on a micro-stage and coupled with an off-the-shelf displacement actuator to realize an economical, versatile and robust micro mechanical test frame with unprecedented combination of force and displacement resolutions and ranges.