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Virtual Coriolis-Force-Based Mode-Matching Micromachine-Optimized Tuning Fork Gyroscope without a Quadrature-Nulling
Yixuan Wu1,2, Weizheng Yuan1,2, Yanjun Xue1,2
1School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
Micromachines
|September 28, 2023
Summary
This study introduces a novel micromachine-optimized tuning fork gyroscope that enhances performance by maximizing scale factor and eliminating the need for a quadrature-nulling loop. This design simplifies complexity and improves bias instability for better gyroscope applications.
Area of Science:
- Microelectromechanical Systems (MEMS)
- Inertial Navigation
- Sensor Technology
Background:
- Traditional tuning fork gyroscopes often require complex quadrature-nulling loops.
- These loops can increase structural complexity and occupy valuable pick-up electrode space.
- Coupling between mode-matching and quadrature-nulling loops can degrade performance.
Purpose of the Study:
- To propose a VCF-based mode-matching micromachine-optimized tuning fork gyroscope.
- To maximize the scale factor of the gyroscope.
- To avoid the use of an additional quadrature-nulling loop, thereby reducing complexity and interference.
Main Methods:
- A mode-matching, closed-loop system was established without a quadrature-nulling loop.
- Quantitative analysis of convergence and matching error was performed.
- Optimal straight beam modeling was used to reduce quadrature coupling.
Main Results:
- Frequency split was significantly narrowed from 20 Hz to 0.014 Hz.
- The scale factor was improved by a factor of 20.6.
- Bias instability (BI) was suppressed by a factor of 3.28.
Conclusions:
- A mode-matching system without a quadrature suppression loop is feasible.
- The proposed gyroscope design offers a competitive solution for mode-matching applications.
- The device demonstrates improved performance metrics, including scale factor and bias instability.
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