A Sub-1 Hz Resonance Frequency Resonator Enabled by Multi-Step Tuning for Micro-Seismometer

Jun Wu, Hideyuki Maekoba, Arnaud Parent, Tamio Ikehashi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We propose a sub-1 Hz resonance frequency MEMS resonator that can be used for seismometers. The low resonance frequency is achieved by an electrically tunable spring with an ultra-small spring constant. Generally, it is difficult to electrically fine-tune the resonance frequency at a near-zero spring constant because the frequency shift per voltage will diverge at the limit of zero spring constant. To circumvent this issue, we propose a multi-step electrical tuning method. We show by simulations that the resonance frequency can be tuned by 0.008 Hz/mV even in the sub-1 Hz region. The small spring constant, however, reduces the shock robustness and dynamic range of the seismometer. To prevent this, we employ a force-balanced method in which the mass displacement is nulled by the feedback force. We show that the displacement can be obtained from the voltage that generates the feedback force.

Original languageEnglish
Article number63
JournalMicromachines
Volume13
Issue number1
DOIs
Publication statusPublished - 2022 Jan

Keywords

  • Electrical tuning
  • Force-balanced
  • MEMS
  • Resonance frequency
  • Seismometer

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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