Opening/Closing Sensor with Three-Axis Sabotage Field Detection
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Solution Overview
Problem
Existing door and window sensors are vulnerable to sabotage magnetic fields, particularly when not actively monitoring the magnetic field changes during transitions, leading to false activations and reduced reliability.
Innovation Solution
A method involving continuous calibration and measurement of magnetic field induction along three orthogonal axes, with noise threshold settings, and comparison of increment modules and arithmetic mean values to detect sabotage fields, using a three-axis magnetometer and reed switches, ensuring reliable detection regardless of door/window state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sensors are active only during a period when an object is under protection, then power consumption is reduced, but the system becomes vulnerable to sabotage magnetic fields applied when the sensor is not activated
Solution Approach 1:
The system implements periodic measurement of magnetic field induction along three orthogonal axes at predetermined time intervals. This allows the sensor to remain in a low-power state between measurements while still detecting sabotage magnetic fields when active, resolving the contradiction between power consumption and reliability.
2Reliability
If complex approaches including magnetic, radio frequency and other types of sensors are used, then reliability of sabotage detection is increased, but device complexity increases
Solution Approach 1:
The system measures magnetic field induction along three orthogonal axes (x, y, z dimensions) using a single magnetometer. This three-dimensional measurement approach provides comprehensive sabotage detection capability without requiring multiple different sensor types, thus increasing reliability while maintaining relatively simple device architecture.
3Reliability
If continuous measurement of magnetic field is performed, then false positives are reduced, but power consumption increases
Solution Approach 1:
The system performs measurements at predetermined time intervals rather than continuously, reducing power consumption while maintaining reliability through appropriate interval selection. The periodic measurement approach balances energy usage with the need to detect sabotage fields and minimize false positives.
Solution Approach 2:
The system compares current magnetic field measurements with previously stored measurement data to determine if sabotage magnetic fields are present. This feedback mechanism allows the system to operate periodically while maintaining high reliability by detecting changes from the baseline state.
4Measurement precision
If calibration is performed by conducting at least two measurements and determining arithmetic mean values, then measurement precision is improved, but measurement time increases
Solution Approach 1:
The system performs calibration measurements and determines arithmetic mean values along three orthogonal axes during the initial setup phase. This preliminary action establishes accurate baseline data that enables reliable sabotage detection during normal operation without requiring repeated calibration, thus improving measurement precision while minimizing time loss.
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
Enhances sensor reliability by minimizing false positives and maintaining continuous magnetic field monitoring, even during state changes, with low power consumption and simplified installation.
Implementation Method 1
measuring, by means of a magnetometer that is mounted in an opening/closing sensor that comprises at least one reed switch and a standard magnet, a magnetic field induction of the standard magnet along three orthogonal axes
Implementation Method 2
a source of the magnetic field is usually a permanent magnet that is fixed on a movable part of the doors or window in most cases. These sensors register a presence or absence of a magnetic field
Data Source
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AI summary
Provided are reliable methods for detecting a sabotage magnetic field and opening/closing sensors for performing the methods, thereby ensuring high sensitivity to various variants of creation of the sabotage magnetic field and ensuring a continuous control of presence or absence of the sabotage field due to continuous measurement of the magnetic field even upon change of a state of doors or windows regardless of whether they are closed or open, whether an object is under protection or not, while at the same time minimizing a sensitivity to interferences that arise within a network during operation of certain devices and, thus, facilitates essential reduction of false positive activations, as well as provides a low power consumption.