Sub-g Bistable Frequency Sensor with a Tunable Threshold

Oren Gad Levi, Naftaly Krakover, Slava Krylov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We report on a bistable electromechanical device with an electrostatically adjustable acceleration threshold allowing real-time, wide-band measurement of a vibrating host structure frequency. The operational principle of the inertial switch-type sensor is based on the level crossing approach. By monitoring the time intervals between the pull-in events resulting in an ohmic contact between the electrodes the signal frequencies in the range between 15 Hz and up to 900 Hz were measured using the device with a natural frequency of 900 Hz. Operation in the vicinity of the critical pull-in point allowed frequency measurements of a signal with sub-g accelerations. Since the device combines both sensing and signal-processing functions, the post-processing of the output, which is wirelessly transmitted to a cell phone, is reduced to minimum. The suggested sensing principle can be implemented in structural health monitoring networks and wearable biomedical devices.

Original languageEnglish
Title of host publication2019 IEEE Sensors, SENSORS 2019 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728116341
StatePublished - Oct 2019
Event18th IEEE Sensors, SENSORS 2019 - Montreal, Canada
Duration: 27 Oct 201930 Oct 2019

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


Conference18th IEEE Sensors, SENSORS 2019


  • electrostatic actuation
  • frequency sensing
  • inertial switch
  • level crossing
  • pull-in


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