Magnetic Ball Calibration Using 3-Axis Field Rotation Detection
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Solution Overview
Problem
Current methods for calibrating magnetic balls in magnetically controlled capsule endoscope systems are cumbersome, complex, and unsuitable for widespread application due to their lack of simplicity, convenience, and accuracy.
Innovation Solution
A magnetic ball calibration method and apparatus that involves rotating the magnetic ball around two axes, using a three-axis magnetic field sensor to acquire detection data, and calibrating the magnetic ball based on the obtained calibration positions, ensuring accurate alignment with the magnetic field components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to obtain magnetic field data for determining the direction of the magnetic ball, then the accuracy of determining the magnetic ball direction is improved, but the complexity of the calibration process increases
Solution Approach 1:
The patent extracts only the essential information needed for calibration by using a single magnetic field sensor to detect specific characteristic points (maximum and minimum magnetic field values) during rotation, rather than using multiple sensors to capture all magnetic field data. This extraction of key calibration points simplifies the system while maintaining calibration accuracy.
Solution Approach 2:
The patent performs preliminary rotation of the magnetic ball to pre-determine its calibration position (where the magnetic polarization direction aligns with the detection axis) before actual calibration. By pre-positioning the magnetic ball at the calibration position through rotation, the system simplifies subsequent calibration operations without requiring multiple sensors.
2Measurement precision
If a complex multi-sensor system is used for magnetic ball calibration, then the calibration accuracy is improved, but the ease of operation deteriorates
Solution Approach 1:
The magnetic ball calibration system uses the magnetic ball's own rotational characteristics and magnetic field distribution to automatically determine its calibration position. The system self-calibrates by detecting the maximum and minimum magnetic field values during rotation, eliminating the need for complex manual multi-sensor setups and making the operation convenient and automatic.
3Measurement precision
If multiple sensors and complex procedures are used for calibration, then the measurement precision is improved, but the time required for calibration increases
Solution Approach 1:
The patent performs preliminary rotation to pre-determine the calibration position before actual calibration. This preliminary action of rotating the magnetic ball to align its magnetic polarization direction with the detection axis reduces the time required for subsequent calibration operations, as the system is already positioned optimally.
Solution Approach 2:
The patent extracts only the critical calibration information (maximum and minimum magnetic field values at specific rotation positions) rather than continuously monitoring all magnetic field data with multiple sensors. This extraction of essential calibration points reduces the time required for calibration while maintaining accuracy.
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 method provides a simple, convenient, and accurate means for calibrating magnetic balls, enhancing the precision of capsule endoscope orientation and information collection.
Implementation Method 1
acquiring detection data of three-axis magnetic field components at a detection position during rotation
Data Source
AI summary
A magnetic ball calibration method and a magnetic ball calibration apparatus is disclosed. The method includes: rotating a magnetic ball around a first axis and a second axis, and acquiring detection data of three-axis magnetic field components at a detection position during rotation; obtaining a calibration position of the magnetic ball according to the detection data; and calibrating the magnetic ball according to the calibration position. When the magnetic ball is located at the calibration position, the magnetic polarization direction of the magnetic ball coincides with the second axis; the first axis is perpendicular to the second axis; the three-axis magnetic field components include an X-axis magnetic field component, a Y-axis magnetic field component and a Z-axis magnetic field component; the direction of the Z-axis magnetic field component and the Y-axis magnetic field component coincide with the direction of the second axis and the first axis, respectively.