A TORSION PENDULUM FOR CHIP-SCALE RELATIVE GRAVIMETRY

Jon R. Pratt, Stephan Schlamminger, Aman R. Agrawal, Dalziel J. Wilson

Research output: Contribution to conferencePaperpeer-review

Abstract

Pendulums were the original tool of gravimetry. Here, we introduce a new microscale platform aimed at this task that takes the form of a chip-scale torsion resonator. We derive a lumped parameter model for the physics of the device, illustrating that the torsional stiffness depends on gravity along with the material and internal stress of its thin-film nanoribbon torsion fiber. Dissipation dilution is introduced within the context of fundamental noise limits of detection, and its influence on design choices discussed. We provide proof of concept data from an “accidental” prototype, resolving a 20 % shift in the device frequency that occurs when inverted in the earth’s gravity to within a few parts in 106. Our result suggests that a chip-scale gravimeter is achieved using nothing more sophisticated than an optical lever to read out the frequency of this resonator.

Original languageEnglish (US)
Pages260-264
Number of pages5
StatePublished - 2021
Event36th Annual Meeting of the American Society for Precision Engineering, ASPE 2021 - Minneapolis, United States
Duration: Nov 1 2021Nov 5 2021

Conference

Conference36th Annual Meeting of the American Society for Precision Engineering, ASPE 2021
Country/TerritoryUnited States
CityMinneapolis
Period11/1/2111/5/21

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Mechanical Engineering

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