Magnetic Door Sensor Threshold Adaptation for Wear-Related Errors
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Solution Overview
Problem
Security systems relying on sensors for monitoring doors or windows often become unreliable over time due to changes in the positioning or alignment of the sensor and magnet, leading to false determinations of the object's state.
Innovation Solution
A sensor system that adjusts thresholds based on changes in magnetic field strength measurements over time to account for shifts in sensor or magnet positioning, ensuring accurate determination of the object's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor and magnet are positioned on a door to detect magnetic field strength for determining door state, then the security monitoring function is provided, but over time the positioning changes due to normal wear and tear causing false determinations
Solution Approach 1:
The system dynamically adjusts the magnetic field strength threshold over time based on actual measurements. Instead of using a fixed threshold, the processor continuously updates the threshold value to adapt to positioning changes of the sensor or magnet, thereby maintaining reliable door state determination despite physical wear and tear
Solution Approach 2:
The system implements feedback by measuring the magnetic field strength multiple times, comparing measurements to determine trends, and using this feedback to adjust the threshold. The processor monitors whether measurements are increasing or decreasing and modifies the threshold accordingly to prevent false determinations
2Device complexity
If a fixed threshold is used for determining door open/closed state, then the determination process is simple, but false determinations occur when sensor positioning changes
Solution Approach 1:
The threshold transitions from a fixed value to a dynamic value that automatically adjusts based on measured magnetic field strength trends. This maintains operational simplicity for the user while internally adapting to positioning changes to preserve determination accuracy
Solution Approach 2:
The system changes the threshold parameter over time based on observed trends in magnetic field measurements. When measurements consistently increase or decrease, the threshold is adjusted to compensate, maintaining accurate door state determination without requiring manual recalibration
3Reliability
If the threshold is adjusted dynamically based on measurement trends, then false determinations are avoided, but the system complexity increases
Solution Approach 1:
The system performs self-calibration by automatically detecting trends in its own measurements and adjusting its own threshold without external intervention. The processor monitors measurement patterns and autonomously modifies the threshold to maintain accuracy, eliminating the need for manual recalibration or complex external adjustment mechanisms
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
Prevents false indications of the object being open when closed or closed when open by dynamically adjusting thresholds in response to normal wear and tear, enhancing the reliability of security monitoring.
Implementation Method 1
The sensor may be configured to detect a magnetic field of the magnet and to measure a strength of the magnetic field
Data Source
AI summary
Systems, apparatuses, and methods are described for monitoring objects. A sensor positioned on an object (e.g., a door) is configured to measure a strength of a magnetic field of a magnet positioned on an associated object (e.g., the door frame). The measurements of the strength of the magnetic field made by the sensor may change over time (e.g., may decrease) due to changes in the positioning or alignment of the sensor or magnet. The positioning or alignment of the sensor or magnet may change due to use of the object (e.g., use of the door). One or more thresholds used by the sensor to determine the status of an object (e.g., to determine whether the door is open or closed) may be adjusted based on changes to the measurements over time.