3D Micro Shell Rate-Integrating Gyroscope with Optical Sensing
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Solution Overview
Problem
Current micro gyroscopes lack the necessary accuracy for navigation applications, particularly in GPS-denied environments, where position sensing errors grow exponentially with time, and require several orders of magnitude higher precision than stabilization applications.
Innovation Solution
A three-dimensional micro shell rate-integrating gyroscope is developed, featuring a support substrate, an inner shell, a resonator, driving electrodes, and integrated optical sensors, which operates by detecting changes in the resonator's motion using electrostatic driving and optical sensing, and is thermally isolated to maintain precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current micro gyroscope designs are used, then manufacturing cost is reduced and device size is minimized, but measurement precision and accuracy are insufficient for navigation applications
Solution Approach 1:
The patent transitions from planar 2D resonator designs to three-dimensional hemispherical shell resonators. This dimensional change enables higher measurement precision by creating resonant structures with superior mechanical Q-factors and reduced sensitivity to fabrication variations, while the hemispherical geometry provides inherent robustness against shock and vibration that would otherwise complicate the device structure
Solution Approach 2:
The patent replaces traditional capacitive sensing mechanisms with optical sensing methods. By using optical interferometry to detect resonator position and motion, the system achieves higher measurement precision without requiring complex capacitive electrode arrangements, thereby reducing overall device complexity while maintaining micro-scale dimensions
2Measurement precision
If micro scale dimensions are used, then device size is minimized and cost is reduced, but accuracy is insufficient for GPS-denied navigation
Solution Approach 1:
The patent employs three-dimensional hemispherical shell resonators instead of planar structures. This dimensional transformation allows the micro-scale device to achieve navigation-grade accuracy by creating resonant modes with higher quality factors and reduced sensitivity to manufacturing tolerances, thereby improving position sensing accuracy without increasing device mass
Solution Approach 2:
The patent optimizes the resonator geometry by varying shell thickness parameters, creating regions of different thickness to enhance specific resonant modes. This parameter optimization improves the mechanical Q-factor and measurement precision of the micro-scale gyroscope, enabling navigation accuracy while maintaining minimal mass
3Reliability
If traditional resonator designs are used, then device simplicity is maintained, but robustness against shock and vibration is insufficient
Solution Approach 1:
The patent utilizes hemispherical shell geometry for the resonator structure. The curved spherical form provides inherent robustness against shock and vibration by distributing mechanical stresses uniformly throughout the structure, eliminating the need for additional protective elements or complex suspension mechanisms that would increase device complexity
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
The gyroscope achieves high accuracy and stability, capable of detecting sub-picometer amplitude changes, effectively addressing the precision requirements for navigation applications while maintaining robustness against shock and vibration.
Implementation Method 1
Two or more driving electrodes are formed on the support substrate and are arranged around periphery of the resonator. The two or more driving electrodes are configured to drive the resonator electrostatically.
Implementation Method 2
A plurality of optical sensors are integrated into the support structure, such that each optical sensor is configured to detect motion of the resonator.
Implementation Method 3
The platform is thermally isolated from the outer shell.
Data Source
AI summary
Gyroscopes are sensors that measure angular rate and angular orientation. A three-dimensional fused silica micro shell rate-integrating gyroscope is presented. One aspect of the gyroscope includes the use of optical sensors to detect motion of the resonator. The proposed gyroscope is attractive because it achieves several magnitudes higher accuracy as well as high vibration and shock insensitivity from a novel resonator design as well as other unique manufacturing processes.