Motion Sensor Adjustment Using Temperature Data to Reduce False Alerts
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Solution Overview
Problem
Smart home motion sensors using passive infrared sensors often generate false alerts due to temperature changes caused by environmental heating systems, leading to unnecessary alerts and reduced sensitivity to actual motion.
Innovation Solution
Implementing a system that uses temperature sensors to differentiate between temperature changes caused by environmental heating and actual motion, adjusting the sensitivity of the passive infrared sensor based on these distinctions, and ignoring alerts triggered by heating vents or rapid temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the passive infrared sensor sensitivity is increased to detect actual motion, then motion detection capability is improved, but false alerts from temperature changes increase
Solution Approach 1:
A temperature sensor is introduced as an intermediary element to monitor ambient temperature changes. The controller uses temperature sensor data to distinguish between temperature-induced infrared signal changes and actual motion, thereby reducing false alerts while maintaining motion detection sensitivity
Solution Approach 2:
The system dynamically adjusts the sensitivity threshold of the passive infrared sensor based on ambient temperature conditions. When temperature changes are detected, the threshold for motion detection is modified to account for thermal variations, allowing the sensor to maintain high sensitivity for actual motion while filtering out temperature-related false signals
2Reliability
If the passive infrared sensor sensitivity is reduced to eliminate false alerts, then false alert rate is decreased, but motion detection capability is reduced
Solution Approach 1:
The sensor sensitivity is made dynamic rather than static. The system continuously monitors temperature conditions and adjusts the infrared sensor sensitivity in real-time, increasing sensitivity when temperature is stable and decreasing it when temperature changes are detected, thus optimizing both detection capability and false alert reduction
3Reliability
If temperature compensation is implemented to distinguish environmental heating from actual motion, then false alert reduction is achieved, but system complexity increases
Solution Approach 1:
The temperature sensor and passive infrared sensor are integrated into a single motion detection device, sharing common processing resources and control logic. This merging approach enables temperature compensation functionality while minimizing the increase in overall system complexity through shared hardware and software components
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
Reduces false alerts by accurately distinguishing between environmental temperature changes and actual motion, enhancing the reliability of motion detection in smart home environments.
Implementation Method 1
Motion sensors may use passive infrared sensors, which may be able to detect heat sources within a room, and detect motion based on the motion of heat sources
Data Source
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AI summary
Inter alia, a computer-implemented method performed by a data processing apparatus is disclosed. The method comprises receiving a signal comprising a current temperature near a motion sensor; receiving at least one signal comprising a current temperature near a temperature sensor in the same room as the motion sensor; determining an adjustment for the motion sensor based on the current temperature near the motion sensor, past temperatures near the motion sensor, at least one current temperature near a temperature sensor in the same room as the motion sensor, and at least one past temperature near a temperature sensor in the same room as the motion sensor; and sending the adjustment to the motion sensor. Further disclosed is a computer-implemented system for motion sensor adjustment.