Distance Sensor Motion Detection for False Alarm Reduction
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Solution Overview
Problem
Existing security systems with emergency call functions face challenges in distinguishing between human movement and non-relevant movements, leading to false alarms, and are inefficient in terms of energy consumption, lacking adaptability to local conditions and comprehensive functionality beyond emergency calls.
Innovation Solution
A microprocessor-supported motion detection system incorporating a distance sensor that measures changes in distance and sends signals to a timer only when a predetermined threshold is exceeded, optimizing movement detection and energy use, while integrating multiple sensors and communication modules for enhanced reliability and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple motion detector and timer system is used, then the system is economical and simple to operate, but it cannot distinguish between human movement and non-relevant movements, leading to false alarms
Solution Approach 1:
The patent combines a motion detector with a distance sensor into an integrated system. The motion detector identifies movement events while the distance sensor provides qualitative information about the moving object's proximity. By merging these two sensors and processing their combined signals through a microcontroller, the system achieves reliable human movement detection without requiring complex individual sensors.
Solution Approach 2:
The system changes the parameter of distance measurement by introducing a distance threshold parameter. The microcontroller compares the measured distance against this threshold to determine whether detected movement represents a genuine emergency situation or a false alarm source (such as a pet or object). This parameter-based differentiation resolves the contradiction by adding simple quantitative criteria to the detection logic.
2Reliability
If multiple sensors are integrated to improve reliability, then false alarms are reduced, but the system becomes uneconomical due to constant power supply requirements
Solution Approach 1:
The system implements periodic action by having the distance sensor operate only intermittently based on motion detector triggers. Instead of continuous operation, the distance sensor is activated periodically when movement is detected, and the microcontroller processes signals in discrete evaluation cycles. This periodic operation mode maintains signal reliability through multiple sensors while dramatically reducing overall power consumption compared to continuous operation.
Solution Approach 2:
The motion detector performs preliminary action by detecting movement before the distance sensor is activated. This preliminary detection allows the system to prepare for potential emergency situations while keeping power-consuming components inactive. Only when the motion detector triggers does the system activate the distance sensor and microcontroller processing, ensuring reliable multi-sensor operation only when needed.
3Measurement precision
If distance measurement is continuously monitored, then movement detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The distance sensor operates periodically rather than continuously, being activated only when the motion detector triggers a measurement cycle. The microcontroller manages discrete evaluation intervals where distance measurements are taken, processed, and then the system enters a low-power state. This periodic measurement approach maintains measurement precision when needed while minimizing energy consumption during idle periods.
Solution Approach 2:
The system implements self-service by having the motion detector automatically trigger distance measurements only when movement occurs. The microcontroller autonomously evaluates whether measured distances indicate genuine emergencies or false alarm sources without requiring continuous monitoring. This event-driven self-service mechanism ensures measurement precision is maintained through automated triggering while eliminating the need for continuous power-consuming monitoring.
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 reduces false alarms by qualitatively assessing movement, optimizes energy consumption, and expands system functionality with adaptive settings and remote monitoring, ensuring reliable and efficient operation.
Implementation Method 1
The sensor system comprises a distance sensor (2) for distance measurement... the distance sensor (2) measures a change from a predefined target distance value to a new actual distance value
Implementation Method 2
Such security systems with an emergency call function are usually based on an infrared motion detector
Data Source
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AI summary
The invention relates to a security system (100) for motion detection (BE) in at least one room, wherein the motion can be measured by means of at least one distance sensor (2) and wherein in a microcontroller (15) a first actual distance value of the distance sensor (2) can be compared with a second actual distance value of the distance sensor (2) and a distance measurement signal (DmS) can be generated, by means of which at least one timer (16) can be triggered and a sensor alarm signal (ssA) internal to the system can be output after a time interval (ZI) has expired.