Cavity Optomechanical Gyroscope Using Optical Driving
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Solution Overview
Problem
Traditional vibratory gyroscopes face challenges with low sensitivity due to inherent electrical and magnetic noises, requiring precise resonance frequency adjustment and high mechanical quality factors, which complicates structural design and reduces measurement bandwidth, making them unsuitable for harsh environments and aerospace applications.
Innovation Solution
A cavity optomechanical vibratory gyroscope is designed with a dual-ring resonant cavity structure using micro-nano optical fibers and SiN/SiO2 materials, employing optomechanical technology for driving and detecting, where whispering gallery mode resonances and Coriolis forces are utilized to achieve high sensitivity and stability, reducing noise interference through a full-optical sensing method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional vibratory gyroscopes use electrical and magnetic driving methods, then they can achieve vibration, but they suffer from low sensitivity due to inherent electrical and magnetic noises
Solution Approach 1:
The patent replaces electrical and magnetic driving methods with optical driving methods. A micro-ring resonator is used to generate optical vibrations that drive the proof mass, eliminating the need for electrical and magnetic actuators. This substitution removes the source of electrical and magnetic noises, thereby improving sensitivity and measurement precision.
Solution Approach 2:
The patent replaces electrical and magnetic detection methods with optical detection methods. Optical sensors are used to detect the vibration of the proof mass and the Coriolis effect, eliminating the need for electrical and magnetic sensors. This substitution removes the source of electrical and magnetic noises in the detection system, thereby improving sensitivity and measurement precision.
2Measurement precision
If traditional vibratory gyroscopes adjust structural parameters to achieve ideal resonance frequency, then they can obtain better signal output quality, but the packaging process is limited by processing precision
Solution Approach 1:
The patent changes the driving mechanism from electrical/magnetic to optical, which fundamentally alters the resonance excitation method. The micro-ring resonator generates optical vibrations at its resonant frequency, which directly drives the proof mass. This parameter change in the driving mechanism eliminates the need for precise structural parameter adjustments during packaging, as the optical resonance can be tuned independently through optical frequency control.
3Measurement precision
If traditional vibratory gyroscopes increase mechanical quality factor to obtain high sensitivity in complex environments, then sensitivity improves, but measurement bandwidth decreases and dynamic measurement range is reduced
Solution Approach 1:
The patent replaces mechanical quality factor optimization with optical resonance optimization. The micro-ring resonator provides high Q-factor optical resonance, which enhances the driving efficiency and signal strength without requiring high mechanical quality factor of the entire structure. This allows the system to achieve high sensitivity while maintaining broader measurement bandwidth and dynamic range, as the optical resonance can be independently optimized without being constrained by mechanical damping.
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 solution enhances the output signal-to-noise ratio, improves long-term stability, and allows for high precision and bandwidth, effectively addressing the limitations of traditional gyroscopes by minimizing electronic circuit driving and noise suppression, while maintaining structural simplicity.
Implementation Method 1
utilizing the advantages of micro-ring resonator whispering gallery mode resonance
Implementation Method 2
based on the principle of angular velocity sensitive structures in the conventional Coriolis vibratory gyroscopes
Data Source
AI summary
A cavity optomechanical vibratory gyroscope pertains to technical fields of resonant optical gyroscopes and micro-optical-electro-mechanical systems. A novel cavity optomechnical Coriolis vibratory micro gyroscope is realized based on ring micro rings and the Coriolis vibration principle, and driving and detection thereof is completely different from conventional electric or magnetic means. Based on the principle of angular velocity sensitive structures in the conventional Coriolis vibratory gyroscopes, full-optical driving, detecting and sensing of a vibratory gyroscope are achieved using cavity optomechnical technologies, which fundamentally suppresses various noises (including thermal noise, cross interference, connection point noise and quadrature error) introduced by electric or magnetic driving. Besides, displacement (vibration) sensing information is obtained according to a linear relationship between frequency shift and light amplitude in the micro cavity optomechnical effect.