Whispering Gallery Mode Optical Gyroscope for High Precision Rotation
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Solution Overview
Problem
Optical gyroscopes face limitations in sensitivity, direction insensitivity, and open-loop operation, which affect their accuracy and reliability in measuring rotations.
Innovation Solution
The implementation of an optical gyroscope based on injection-locked laser-whispering gallery mode resonators, utilizing a laser locked in frequency to an optical whispering gallery mode resonator, with multiple lock loops and optical modulators to stabilize counter-propagating light beams and enhance sensitivity, and incorporating temperature compensation to address temperature dependencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical ring interferometer configuration is used, then the gyroscope can measure rotation based on Sagnac effect, but the sensitivity and resolution are limited compared to navigation-grade fiber optic gyroscopes
Solution Approach 1:
The patent replaces traditional mechanical fiber optic winding structures with a compact microresonator-based optical system. The microresonator uses whispering gallery modes to confine and circulate light, eliminating the need for complex fiber coil assemblies while achieving superior sensitivity through enhanced light-matter interaction and resonance effects.
Solution Approach 2:
The patent changes the operational parameters by using resonance frequency locking instead of traditional interferometric phase measurement. The laser frequency is locked to the microresonator's whispering gallery modes, and rotation-induced frequency shifts are measured, providing higher sensitivity and resolution compared to conventional approaches.
2Adaptability or versatility
If conventional optical gyroscope design is used, then the system can operate in open-loop mode, but it lacks direction sensitivity and closed-loop operation capability
Solution Approach 1:
The patent implements closed-loop operation by using the detected rotation signal to adjust and stabilize the laser frequency locking. The system continuously monitors the resonance frequency shifts caused by rotation and applies feedback control to maintain accurate measurement, enabling both direction sensitivity and improved reliability through active stabilization.
3Measurement precision
If temperature compensation is not implemented, then the device structure remains simple, but temperature dependencies cause measurement biases and reduced accuracy
Solution Approach 1:
The patent addresses temperature dependencies by implementing active temperature control and compensation mechanisms. The system monitors temperature variations and adjusts operational parameters or applies correction algorithms to compensate for thermal effects on the microresonator's resonance frequency, maintaining measurement accuracy across varying temperature conditions.
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 configuration achieves improved sensitivity, direction sensitivity, and closed-loop operation, surpassing navigation-grade fiber optic gyroscopes by two orders of magnitude in resolution and reducing temperature-related biases, resulting in a more accurate and reliable rotation measurement system.
Implementation Method 1
an optical coupler fixed relative to the optical resonator and evanescently coupled to the optical resonator to couple the laser light into one or more optical whispering gallery modes of the optical resonator and to couple the laser light in a particular optical whispering gallery mode inside the optical resonator as an injection laser beam back to the laser to cause injection locking of the laser to the particular optical whispering gallery mode
Implementation Method 2
an optical resonator fixed in position relative to the laser and made of an optical material and structured to support optical whispering gallery modes that propagate in opposite directions in a closed optical loop in the optical resonator
Implementation Method 3
a beam splitter fixed in position in an optical path of the laser light between the laser and the optical coupler to split a portion of the laser propagating towards the optical coupler as a first laser beam and to split a portion of the injection laser beam propagating towards the laser into a second laser beam
Implementation Method 4
an optical detector that receives the combined laser beam to produce a detector output that contains phase shift information in the optical interference between the first and second laser beams indicating a rotation of the optical resonator
Implementation Method 5
an optical coupler fixed relative to the optical resonator and evanescently coupled to the optical resonator to couple the laser light into one or more optical whispering gallery modes of the optical resonator
Data Source
AI summary
Optical gyroscope devices based on optical whispering gallery mode resonators that measure rotations based on rotation-induced optical phase shift in optical whispering gallery mode resonators.