Intraocular Pressure Inspection Device Using Weighted Coordinate Fusion
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Solution Overview
Problem
Conventional intraocular pressure inspection devices require skilled operators to accurately align the detection unit with the eyeball's vertex, limiting their use to narrow areas and leading to inconvenient and infrequent measurements due to system noise and motor responsiveness issues.
Innovation Solution
An intraocular pressure inspection device integrating a high-precision positioning system with a wide-area positioning system and a triaxial servo table, where a processor adjusts weights of coordinates to generate integrated coordinates for precise alignment, using a PID controller and fuzzy logic to control the servo table's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-precision positioning system is used to align the intraocular detection unit to the eyeball vertex, then measurement precision is improved, but the working area becomes too narrow and the system becomes difficult to operate automatically
Solution Approach 1:
The positioning system is divided into two independent subsystems: a wide-area positioning system that provides coarse positioning over a large range, and a high-precision positioning system that provides fine positioning within a narrow area. This segmentation allows each subsystem to optimize for its specific function while working together to achieve both wide coverage and high precision
Solution Approach 2:
A processor serves as an intermediary that receives coordinates from both positioning systems, integrates them through weighted fusion, and generates final control commands for the triaxial servo table. This intermediary component harmonizes the outputs of the two subsystems, enabling seamless transition between wide-area and high-precision positioning modes
2Measurement precision
If the triaxial servo table is controlled to align the detection unit according to high-precision coordinates, then positioning accuracy is improved, but the control may depart from the working area due to system noise and motor responsiveness
Solution Approach 1:
The wide-area positioning system performs preliminary positioning to bring the detection unit into the narrow working area of the high-precision positioning system before fine alignment is attempted. This preliminary action ensures that subsequent high-precision control operations remain within the reliable working range
Solution Approach 2:
The system dynamically adjusts the weight parameters in the coordinate integration formula based on the current positioning stage. During wide-area positioning, the wide-area system is given higher weight; during fine alignment, the high-precision system is given higher weight. This parameter change optimizes performance at different stages and prevents departure from the working area
3Measurement precision
If a narrow working area positioning system is used, then measurement precision is improved, but the device complexity increases and requires well-trained operators
Solution Approach 1:
Two positioning systems with different characteristics are merged into a unified positioning framework. The wide-area system and high-precision system are combined through coordinate integration, creating a composite positioning solution that leverages the strengths of both systems while mitigating their individual weaknesses
4Ease of operation
If automatic alignment is implemented using integrated coordinates from both positioning systems, then ease of operation is improved, but the device complexity increases
Solution Approach 1:
The system performs automatic alignment through self-service mechanisms: the positioning systems automatically detect the eyeball vertex, the processor automatically integrates the coordinates, and the servo table automatically adjusts the detection unit position. This eliminates the need for operator intervention in the alignment process
Data Source
AI summary
An intraocular pressure inspection device includes an intraocular pressure detection unit, a high-precision positioning system and a wide-area positioning system, wherein according to the position of the intraocular pressure detection unit, a set of high-precision coordinates output by the high-precision positioning system and a set of wide-area coordinates output by the wide-area positioning system are integrated in appropriate weights to obtain a set of more precise integrated coordinate. The above-mentioned intraocular pressure inspection device can prevent the intraocular pressure detection unit from failing to operate once it is not in the working area of the high-precision positioning system.