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Summary

Micro-opto-electro-mechanical accelerometers offer high sensitivity and noise immunity. Schemes with altering gaps show the highest sensitivity, making them ideal for precise acceleration measurement.

Keywords:
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Area of Science:

  • Optoelectronics
  • MEMS Technology
  • Sensor Design

Background:

  • Micro-opto-electro-mechanical (MOEM) accelerometers are gaining attention due to high sensitivity and electromagnetic noise immunity.
  • Traditional accelerometers face limitations that MOEM devices aim to overcome.

Purpose of the Study:

  • To analyze 12 different schemes of MOEM-accelerometers.
  • To evaluate the performance and sensitivity of various MOEM-accelerometer designs.

Main Methods:

  • Investigated MOEM-accelerometers utilizing a spring mass and tunneling-effect-based optical sensing.
  • Analyzed optical directional couplers with fixed and movable waveguides separated by an air gap.
  • Examined changes in gap, coupling length, and overlapping area under acceleration.

Main Results:

  • Schemes with altering coupling lengths have lower sensitivity but a virtually unlimited dynamic range, comparable to capacitive transducers.
  • Schemes with changing overlapping areas demonstrate moderate sensitivity (1.25 × 10^6 m^-1).
  • Schemes with an altering gap exhibit the highest sensitivity, exceeding 6.25 × 10^6 m^-1.

Conclusions:

  • The sensitivity of MOEM-accelerometers is highly dependent on the design parameters, particularly the gap between waveguides.
  • Altering the gap in optical sensing systems offers the most promising approach for achieving ultra-high sensitivity in MOEM accelerometers.