Embedded Dither Pickoff Layout for Low-Vibration Ring Laser Gyroscopes
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Solution Overview
Problem
Conventional ring laser gyroscopes (RLGs) face issues with dither motor complexity, cost, and vibration sensitivity due to separate piezo-ceramic elements for dither pickoff, leading to non-ideal dither motion and coning/sculling correction errors in vibration environments.
Innovation Solution
A drive-embedded symmetric dither pickoff configuration for RLGs, where piezoelectric transducers are mounted on both sides of reeds with insulative gaps to reduce second harmonic noise and eliminate vibration sensitivity, eliminating the need for separate pickoff elements and enhancing mechanical symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate piezo-ceramic elements are used for dither pickoff, then the pickoff function is achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines the pickoff function and drive function into a single integrated piezoelectric transducer assembly. The pickoff embedded drive piezoelectric transducer incorporates both pickoff sections (for detecting dither motion) and drive sections (for actuating the reed) within one unified structure, eliminating the need for separate pickoff piezo-ceramic elements and reducing overall device complexity
Solution Approach 2:
The integrated piezoelectric transducer serves multiple functions simultaneously: it acts as both a pickoff element for detecting reed deflection and a drive element for actuating the reed motion. This multi-functional design reduces the number of components needed while maintaining the required pickoff and drive functions
2Reliability
If separate piezo-ceramic elements are used for dither pickoff, then the pickoff function is achieved, but manufacturing cost increases
Solution Approach 1:
By merging the pickoff and drive functions into a single integrated transducer, the patent reduces the total number of piezoelectric elements required. This consolidation lowers material costs, assembly costs, and overall manufacturing complexity compared to using separate pickoff and drive piezo-ceramic elements
3Device complexity
If single-reed pickoff elements are used, then the structure is simple, but vibration sensitivity increases causing coning/sculling errors
Solution Approach 1:
The patent employs a symmetric configuration with multiple reeds (typically three) arranged around the hub, with pickoff embedded drive piezoelectric transducers positioned on alternating reeds. This symmetric local arrangement creates a balanced structure that rejects linear vibration while maintaining sensitivity to rotational dither motion, thereby reducing coning/sculling errors in vibration environments
Solution Approach 2:
The patent uses asymmetric placement of pickoff embedded drive piezoelectric transducers on alternating reeds rather than symmetric placement on all reeds. This asymmetric configuration, combined with the back-to-back mounting on individual reeds, creates differential measurement capability that distinguishes between rotational dither and linear vibration, reducing vibration-induced errors
4Device complexity
If pickoff reed is mechanically asymmetric, then the structure is simplified, but non-ideal dither motion occurs causing performance issues
Solution Approach 1:
The patent deliberately introduces controlled asymmetry through the back-to-back mounting configuration of pickoff embedded drive piezoelectric transducers on each reed. This asymmetric placement, with one transducer on the first side and another on the opposing second side, creates a balanced differential measurement system that maintains ideal dither motion characteristics while simplifying the overall reed structure
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 reduces cost and complexity, improves mechanical symmetry, and significantly reduces vibration sensitivity, enhancing the performance of the dither motor by eliminating pickoff vibration sensitivity and improving noise reduction.
Implementation Method 1
A first pickoff embedded drive piezoelectric transducer is mounted on the first side of at least one reed... A second pickoff embedded drive piezoelectric transducer is mounted on the second side of the at least one reed
Implementation Method 2
a first pickoff section, and a first drive section that is separated from the first pickoff section by a first insulative gap... a second pickoff section, and a second drive section that is separated from the second pickoff section by a second insulative gap
Data Source
AI summary
Drive-embedded dither pickoff embodiments for a dither motor of a ring laser gyroscope are disclosed. In one embodiment, an apparatus comprises a dither motor comprising an outer rim; a hub section; and a plurality of reeds that couple the hub section with the outer rim. A first pickoff embedded drive transducer is mounted on a first side of at least one reed. The first pickoff embedded drive transducer includes a first pickoff section, and a first drive section that is separated from the first pickoff section by a first insulative gap. A second pickoff embedded drive transducer is mounted on a second side of the at least one reed in a back-to-back relationship with the first pickoff embedded drive transducer. The second pickoff embedded drive transducer includes a second pickoff section, and a second drive section that is separated from the second pickoff section by a second insulative gap.