Window Sensor Potentiometer Vibration Detection
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Solution Overview
Problem
Existing devices for detecting the state of windows or doors, particularly in the context of violent acts or external forces, lack reliability in distinguishing between legitimate vibrations and false alarms, and do not effectively adapt to varying environmental conditions.
Innovation Solution
A device incorporating a potentiometer as the first sensor unit for detecting open, tilted, or closed states, combined with a vibration sensor unit for detecting force-induced vibrations, featuring an additional evaluation unit for signal plausibility checks, a filter circuit for signal selection, and a compact weatherproof housing for enhanced reliability and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration sensor is added to detect violent acts, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the vibration sensor (second sensor unit) with the existing potentiometer-based sensor (first sensor unit) into a single integrated device. The control unit processes signals from both sensor units, merging their functions to detect both position/state and vibrations simultaneously. This integration improves detection capability while managing device complexity through unified control logic.
Solution Approach 2:
The control unit serves multiple functions: it processes signals from the potentiometer for position detection, processes signals from the vibration sensor for violence detection, and performs plausibility checks by comparing signals from both sensor units. This multi-functionality allows a single control unit to handle diverse detection tasks, improving reliability without proportionally increasing complexity.
2Reliability
If signal filtering and plausibility checks are implemented, then false alarms are reduced, but device complexity increases
Solution Approach 1:
The control unit performs plausibility checks by comparing signals from the first sensor unit (potentiometer) with signals from the second sensor unit (vibration sensor). When a violent act is detected through the vibration sensor, the system checks whether the potentiometer signal plausibly reflects the corresponding physical state change. This feedback mechanism reduces false alarms by validating detections against multiple independent measurements.
Solution Approach 2:
The system performs preliminary plausibility checks on vibration sensor signals before triggering alarm conditions. By evaluating whether detected vibrations correspond to plausible physical states (verified through the potentiometer reading), the system filters out false positives in advance. This preliminary validation prevents unnecessary alarms while maintaining detection sensitivity.
3Volume of moving object
If multiple sensors are integrated in a common housing, then compact structure is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent places the vibration sensor and potentiometer-based sensor unit within a common housing, creating a nested structure where multiple sensor components are integrated into a single compact assembly. The control unit and signal processing components are housed together with the sensors, forming a unified device that occupies minimal installation space while containing multiple functional elements.
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 provides improved detection of violent acts by reducing false alarms and adapting to different conditions, ensuring reliable state monitoring of windows or doors, including during forceful events and environmental disturbances.
Implementation Method 1
the at least one second sensor to be in the form of a vibration sensor with at least one piezoceramic bimorph element
Data Source
Figure 1
Figure 2~3
AI summary
A device (1) for sensing a state of a window or door comprises at least one first sensor unit (3) for sensing a state of an open, tilted or closed window/door by means of a potentiometer as a first sensor (4) and by means of an actuator (5) connected to the potentiometer. The device (1) further comprises at least one second sensor unit (7) for sensing another state of the window or door, said state involving vibrations or oscillations caused by the effect of force.