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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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A high-sensitivity MEMS gravimeter with a large dynamic range.

Shihao Tang1, Huafeng Liu1, Shitao Yan1

  • 11MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, 430074 Wuhan, PR China.

Microsystems & Nanoengineering
|October 23, 2019
PubMed
Summary
This summary is machine-generated.

This study presents a practical micro-electromechanical-system (MEMS) gravimeter with enhanced sensitivity and dynamic range. This advancement offers a more accessible solution for precise gravitational acceleration measurements in various geophysical applications.

Keywords:
Electrical and electronic engineeringOptical physics

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Area of Science:

  • Geophysics and Earth Sciences
  • Instrumentation and Measurement

Background:

  • Precise measurement of local gravitational acceleration is crucial for natural hazard forecasting, prospecting, and geophysical studies.
  • Existing gravimetry technologies are often characterized by high cost, large mass, and significant volume, limiting their widespread applicability.
  • Micro-electromechanical-system (MEMS) technology offers a potential solution to miniaturize gravimeters, but current MEMS devices lack the sensitivity and dynamic range of commercial counterparts.

Purpose of the Study:

  • To develop a more practical and high-performance micro-electromechanical-system (MEMS) gravimeter.
  • To overcome the limitations of existing MEMS gravimeters in terms of sensitivity and dynamic range.
  • To enable broader deployment and application of MEMS gravimetry in geophysical research and hazard assessment.

Main Methods:

  • Development of a novel MEMS gravimeter incorporating an advanced suspension design.
  • Integration of a customized optical displacement transducer for enhanced measurement precision.
  • Performance validation through co-site earth tides measurement alongside a commercial superconducting gravimeter (GWR iGrav).

Main Results:

  • The proposed MEMS gravimeter achieved a high sensitivity of 8 μGal/√Hz.
  • The device demonstrated a large dynamic range of 8000 mGal, significantly improving upon previous MEMS gravimeters.
  • Co-site measurements showed a strong correlation coefficient of 0.91 with a commercial superconducting gravimeter.

Conclusions:

  • The developed MEMS gravimeter offers a practical and high-performance alternative to traditional gravimetry systems.
  • The enhanced sensitivity and dynamic range make it suitable for demanding geophysical applications.
  • This advancement paves the way for more accessible and globally deployable gravimetry solutions.