MEMS Angular Rate Sensor With Coriolis Amplification and Mode Decoupling
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Solution Overview
Problem
Existing MEMS vibratory gyroscopes face challenges such as inefficient actuation energy use, mechanical crosstalk between drive and sense modes, decoupling issues, and quadrature errors, limiting their performance in tactical-grade applications.
Innovation Solution
A MEMS angular rate sensor with a mechanical structure that amplifies Coriolis-induced movement, suppresses parasitic in-phase motion, and decouples drive and sense modes, utilizing in-plane linear movement and quadrature error compensation to enhance sensitivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical or electrical sensors are used to detect angular rate, then measurement capability is achieved, but the device suffers from high susceptibility to mechanical stress, temperature changes, and electromagnetic interference
Solution Approach 1:
The patent replaces conventional mechanical or electrical angular rate sensors with a biological cell-based sensor system. Living cells are used to detect angular rate through their natural biological responses to mechanical rotation, eliminating the need for traditional mechanical components that are susceptible to stress and electromagnetic interference. The cells convert mechanical rotation into measurable biological signals without requiring electrical components.
Solution Approach 2:
The patent changes the measurement parameter from electrical or mechanical signals to biological responses. By measuring changes in cell behavior, metabolism, or physiological parameters in response to rotation, the system achieves immunity to electromagnetic interference and mechanical stress that affect conventional sensors. The biological parameter changes provide a new measurement modality that is inherently resistant to these harmful factors.
2Device complexity
If conventional sensors are used, then angular rate detection is possible, but the sensors require complex protection mechanisms against harmful environmental factors
Solution Approach 1:
The patent eliminates the need for complex protection mechanisms by replacing mechanical and electrical sensors with biological cells. The cells are contained in a simple chamber or microfluidic device that provides basic environmental control without requiring elaborate shielding or protection systems. The biological system itself is naturally resistant to electromagnetic interference and can be protected from mechanical stress through simple containment structures.
3Reliability
If biological cell-based sensors are used to reduce susceptibility to harmful factors, then reliability improves, but the sensor output may be influenced by cell metabolism and other biological factors
Solution Approach 1:
The patent extracts and measures only the specific biological response related to angular rate detection while separating it from other metabolic influences. By focusing on particular cellular responses that are directly caused by rotation (such as shear stress on cell membranes or specific mechanosensitive channel activations) and using appropriate control measurements, the system isolates the rotation signal from confounding metabolic factors.
Solution Approach 2:
The patent implements feedback mechanisms to monitor and compensate for metabolic influences on cell output. By continuously measuring baseline metabolic activity and comparing it against rotation-induced changes, the system can distinguish between metabolic variations and true angular rate signals. The feedback loop allows for real-time correction of metabolic drift and maintains measurement precision despite ongoing cellular metabolism.
Data Source
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AI summary
A micro-electromechanical sensor, MEMS, device for measuring z-axis angular rate, the device comprising: a substrate defining a substrate plane and a z-axis perpendicular to the substrate plane; a first vibratory structure comprising a first proof mass and a second proof mass; a second vibratory structure comprising a first sense mass and a second sense mass, the first and second proof masses each respectively having first and second drive structures comprising first and second drive masses, respectively, said drive structures for generating drive-mode movements of said proof masses in drive-mode direction (x), the drive mode corresponding to the anti-phase movement of said proof masses; wherein the first and second vibratory structures being elastically coupled to each other, the device further comprising a mechanical structure for amplifying a Coriolis-induced movement in the sense mode direction (y) of said proof masses and for converting said amplified Coriolis induced movement into movement of the sense masses in the drive-mode direction (x), wherein the in-phase sense movement of said proof masses is suppressed, the mechanical structure comprising a lever pivotable about the z-axis and a mechanical decoupler for decoupling the drive and sense modes.