Micromechanical Gyroscope Resonance Frequency Matching
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Solution Overview
Problem
Microelectromechanical gyroscope devices face challenges in achieving accurate angular velocity sensing due to the trade-off between signal sensitivity and noise amplification, which is influenced by the separation of primary and secondary resonant frequencies, leading to instability and reduced robustness.
Innovation Solution
The implementation of a strongly damped feed-back loop to control the secondary resonator, allowing the primary and secondary frequencies to coincide, thereby improving signal levels with minimal additional device components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the primary and secondary resonant frequencies are separated to reduce sensitivity to external vibrations, then stability over environmental changes is improved, but the detected amplitude becomes relatively low leading to poor signal-to-noise ratio
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the resonant frequency of the secondary resonator to match the primary resonator's frequency. This frequency matching parameter change enables resonance gain amplification of the Coriolis signal, dramatically improving the signal-to-noise ratio while maintaining environmental stability through the feedback control mechanism
2Measurement precision
If the primary and secondary resonant frequencies are brought closer to amplify Coriolis movement, then signal-to-noise ratio is improved, but sensitivity to external and internal factors increases requiring added mechanical structures
Solution Approach 1:
The patent implements feedback control by continuously monitoring the secondary resonator's response and adjusting its resonant frequency to match the primary resonator. This active feedback mechanism achieves frequency matching and resonance gain without requiring additional mechanical structures, thereby improving signal-to-noise ratio while maintaining device simplicity and robustness
Solution Approach 2:
The patent replaces passive mechanical frequency-matching structures with an active electronic feedback control system. Instead of using complex mechanical arrangements to maintain frequency alignment, the invention uses electronic sensing and actuation to dynamically adjust the secondary resonator's frequency, substituting mechanical complexity with electronic control
3Measurement precision
If excessive quality factor is used in the sensing system to amplify resonant peak, then signal amplification is achieved, but susceptibility to shock and fabrication differences increases
Solution Approach 1:
The patent employs feedback control to manage the quality factor of the sensing system. By actively regulating the resonant response through feedback, the system achieves optimal resonant peak amplification for signal detection while preventing excessive quality factor that would increase susceptibility to shock and fabrication variations, thus balancing signal amplification with robustness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly enhances the signal-to-noise ratio and reduces sensitivity to external vibrations, achieving improved zero-point stability and robustness without increasing the device's complexity.
Implementation Method 1
a second mechanical resonator coupled to the first mechanical resonator to produce associated sense mode vibration in a direction that is perpendicular to the direction of the drive mode vibration
Implementation Method 2
a feed-back loop connected to the second mechanical resonator and adjusted to damp the sense mode vibration of this second resonator
Implementation Method 3
The resonance frequencies of the first and second mechanical resonators are adjusted to essentially coincide
Data Source
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AI summary
A sensing device comprising a micromechanical gyroscope, the gyroscope comprising: An improved sensing device with a micromechanical gyroscope, where the resonance frequency of the first mechanical resonator and the resonance frequency of the second mechanical resonator are adjusted to essentially coincide. The device comprises a feed-back loop connected to the second mechanical resonator, the quality factor of the combination of the feed-back loop and the second mechanical resonator being less than 10. More accurate sensing is achieved without essentially adding complexity to the sensor device configuration.