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Microelectromechanical system gravimeters as a new tool for gravity imaging.

Richard P Middlemiss1, Steven G Bramsiepe2, Rebecca Douglas2

  • 1SUPA School of Physics and Astronomy, University of Glasgow, Kelvin Building, University Avenue, Glasgow G12 8SU, UK richard.middlemiss@glasgow.ac.uk.

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|April 18, 2018
PubMed
Summary

A novel microelectromechanical system (MEMS) gravimeter achieved 40 ppb sensitivity and measured Earth tides. This portable device shows potential for field applications, with miniaturization efforts ongoing.

Keywords:
accelerometergeometric anti-springgravimetermicroelectromechanical systemsensortransducer

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Area of Science:

  • Geophysics
  • Instrumentation
  • Tectonics

Background:

  • Microelectromechanical systems (MEMS) offer potential for miniaturized, high-sensitivity sensors.
  • Gravimeters are crucial for measuring gravitational acceleration and its variations.
  • Previous MEMS gravimeters have not been demonstrated for Earth tide measurements.

Purpose of the Study:

  • To develop and demonstrate a MEMS gravimeter capable of measuring Earth tides.
  • To assess the field-portability and performance of the MEMS gravimeter.
  • To showcase the potential of MEMS technology in geophysical field measurements.

Main Methods:

  • Fabrication of a MEMS gravimeter with 40 ppb sensitivity.
  • Measurement of Earth tides using the developed MEMS gravimeter.
  • Field testing including measurements in a lift shaft and on a hill to demonstrate free-air and Bouguer effects.

Main Results:

  • Successful measurement of Earth tides with a MEMS gravimeter, a first demonstration.
  • Demonstrated free-air and Bouguer effects by measuring gravitational acceleration changes during vertical displacement.
  • Achieved a sensitivity of 40 ppb with a 1-second integration time.

Conclusions:

  • The developed MEMS gravimeter is a promising field-portable instrument for geophysical measurements.
  • MEMS technology enables new possibilities for miniaturized and sensitive gravimetry.
  • Further miniaturization is underway, aiming for smartphone-sized devices.