Inductive Proximity Sensing for Fast Ferromagnetic Position Detection
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Solution Overview
Problem
Conventional proximity sensors in the aviation industry lack the necessary speed, reliability, and economic viability to meet the demands of modern aircraft, particularly in terms of accurately sensing the position of ferromagnetic targets with improved precision and response time.
Innovation Solution
A proximity sensor system that transmits a magnetic field signal, measures the impedance of an inductor, and calculates the relative position of a target using a ratio of DC voltage changes across the inductor and a reference resistor, providing a near/far output status within 4 milliseconds, utilizing a controller and electronics with a reference resistor and inductor sensor to achieve precise position sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional proximity sensing methods are used, then basic distance detection is achieved, but speed and reliability are insufficient for modern aircraft demands
Solution Approach 1:
The patent replaces conventional mechanical or slow electrical proximity sensing methods with an inductance-based sensing system that uses magnetic field interaction. The inductor sensor detects changes in inductance caused by ferromagnetic targets, providing faster and more reliable position detection suitable for modern aircraft applications.
Solution Approach 2:
The system measures changes in inductance parameters of the sensor coil as the ferromagnetic target approaches or moves away. By monitoring the inductance parameter variations and converting them to position information, the system achieves both high speed and reliability in proximity detection.
2Reliability
If conventional proximity sensors are used, then basic functionality is provided, but size and weight are not optimized
Solution Approach 1:
The patent integrates the sensor electronics, controller, and inductor sensor into a single compact proximity sensor assembly. By merging these components into one unit, the system achieves reliable position sensing while minimizing overall size and weight, which is critical for aircraft applications.
3Measurement precision
If conventional proximity sensors are used, then basic detection is achieved, but cost-effectiveness is insufficient
Solution Approach 1:
The system uses the ferromagnetic target itself to modify the magnetic field and induce changes in the inductor's inductance. This self-service approach eliminates the need for additional active components on the target side, reducing overall system cost while maintaining high measurement precision through inductance-based detection.
4Speed
If faster response time is achieved, then speed is improved, but measurement precision may be compromised
Solution Approach 1:
The controller continuously monitors the inductance changes and provides real-time position information with a response time below 4 milliseconds. The feedback mechanism ensures that both speed and precision are maintained by continuously adjusting the measurement based on the changing magnetic field conditions as the target moves.
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
The solution enhances the reliability, reduces size and weight, and improves the cost-effectiveness of proximity sensors, enabling faster and more accurate position detection of ferromagnetic targets, thus addressing the limitations of existing systems.
Implementation Method 1
transmitting a magnetic field signal by a controller of a proximity sensor at a target
Implementation Method 2
measuring impedance of an inductor of a proximity sensor
Data Source
AI summary
A method of measuring target proximity comprising the steps of transmitting a magnetic field signal by a controller of a proximity sensor at a target, measuring impedance of an inductor of a proximity sensor, calculating a relative position of the target in relation to a sensor face, and providing a near/far output status of the target at a predetermined rate.