Position Detection System Frequency Drift Compensation
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Solution Overview
Problem
Existing position detection systems for capsule medical devices face challenges in accurately detecting the position and orientation due to changes in resonant frequency caused by temperature or environmental changes, leading to reduced measurement accuracy and shortened device life, especially in small devices where size and power constraints are significant.
Innovation Solution
A position detection system that includes a magnetic induction coil, a driving coil, magnetic sensors, a measurement-reference-value calculating section, a position-analyzing section, and a redetermining section that adjusts the position-calculating frequency based on changes in frequency characteristics, allowing for continuous accurate detection of the device's position and orientation despite changes in temperature or environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the capsule medical device is reduced, then the device becomes easier to swallow and more compact, but the electric power supplied to the magnetic-field generating circuit is limited, reducing magnetic field intensity and position detection accuracy
Solution Approach 1:
The system dynamically adjusts the position-calculating frequency based on detected changes in resonant frequency characteristics. The redetermining section periodically updates the frequency used for position calculation to match the current resonant frequency of the magnetic induction coil, ensuring accurate position detection despite frequency drift caused by temperature or environmental changes.
Solution Approach 2:
The system changes the operating parameter (position-calculating frequency) adaptively. Instead of using a fixed frequency, the system monitors resonant frequency characteristics and adjusts the position-calculating frequency to track the resonant frequency, maintaining optimal detection conditions throughout the device's operation.
2Volume of moving object
If the size of the capsule medical device is reduced, then the device becomes more compact, but the life of the power supply is shortened
Solution Approach 1:
The system uses periodic action by employing an LC resonant circuit that oscillates at its resonant frequency. The magnetic induction coil and capacitor create a self-sustaining oscillating system that efficiently generates the required magnetic field with minimal power consumption, extending power supply life.
Solution Approach 2:
The system utilizes electromagnetic resonance, a form of energy phase transition, where electrical energy is efficiently converted to magnetic field energy and back. This resonant energy exchange minimizes power loss and extends the operational life of the limited power supply in compact devices.
3Ease of operation
If a fixed position-calculating frequency is used, then the system is simpler to operate, but detection accuracy decreases when resonant frequency changes due to temperature or environmental factors
Solution Approach 1:
The system implements feedback by detecting the resonant frequency characteristics of the magnetic induction coil and using this information to adjust the position-calculating frequency. The detection device monitors frequency changes and feeds this information back to the redetermining section, which updates the position-calculating frequency to maintain accurate position detection.
Solution Approach 2:
The system performs self-adjustment by automatically detecting its own resonant frequency characteristics and adjusting its operating parameters accordingly. The device monitors its own frequency drift and self-corrects the position-calculating frequency without external intervention, maintaining accuracy while keeping the operation simple.
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 solution maintains high detection accuracy for the position and orientation of the device by dynamically adjusting the position-calculating frequency, thereby extending the device's operational life and enabling its use in smaller, more compact forms.
Implementation Method 1
a magnetic induction coil 42; a driving coil 51 that generates an alternating magnetic field, to be applied to the magnetic induction coil 42
Implementation Method 2
having a position-calculating frequency in the vicinity of a resonant frequency of the magnetic induction coil 42
Data Source
AI summary
A position detection system and method in which the accuracy of position measurement of a device is not decreased with changes in the resonant frequency. The system includes a device having a magnetic induction coil; a driving coil generating an alternating magnetic field, applied to the magnetic induction coil, having a position-calculating frequency in the vicinity of a resonant frequency of the magnetic induction coil; a plurality of magnetic sensors that detects an induced magnetic field generated by the magnetic induction coil; a measurement-reference-value calculating section determining a measurement reference value at the position-calculating frequency when only the alternating magnetic field is applied; a position-analyzing section calculating at least one of the position and orientation of the device and the measurement reference value when the alternating magnetic field and the induced magnetic field are applied; and a redetermining section redetermining the position-calculating frequency at a predetermined timing.