Door-Integrated Motion Sensor for Exit Detection
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Solution Overview
Problem
Existing systems for monitoring a person's movement in a room are inefficient due to constant power consumption and increased signaling load, leading to unnecessary power usage and false alarms, and require multiple sensors which increase complexity and costs.
Innovation Solution
A single device that combines door opening and closing detection with movement detection, processing data only upon door closure to reduce power consumption and false alarms, and integrates communication circuitry for alert messaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion detecting sensors are constantly on and transmit indication when movement is detected, then movement detection capability is improved, but power consumption increases
Solution Approach 1:
The motion detecting sensor operates in a periodic manner rather than continuously. The control circuitry activates the sensor to take measurements at specific intervals or under specific conditions (e.g., when door opening/closing is detected), thereby maintaining movement detection capability while significantly reducing power consumption compared to constant operation.
2Measurement precision
If motion detecting sensor transmits indication each time when movement is detected, then movement monitoring accuracy is improved, but signaling load increases
Solution Approach 1:
The control circuitry processes motion sensor data locally and only generates notifications when specific conditions are met (e.g., movement detected after door closing). This feedback mechanism filters out unnecessary signals and reduces signaling load while maintaining accurate movement monitoring through intelligent data evaluation.
3Reliability
If multiple sensor devices are used for monitoring, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The invention combines door opening/closing detection functionality with motion detection functionality into a single integrated device. The control circuitry processes both door sensor data and motion sensor data together, eliminating the need for separate sensor systems and reducing overall device complexity while maintaining detection reliability through multi-functional integration.
4Measurement precision
If motion detection is performed continuously, then exit detection accuracy is improved, but power consumption increases
Solution Approach 1:
The system performs preliminary detection of door opening/closing events first, then activates continuous motion detection only when relevant (e.g., after door closing). This preliminary action approach ensures accurate exit detection by monitoring motion at critical moments while avoiding continuous power-intensive monitoring during periods when exit detection is not needed.
Data Source
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Figure 3
Figure 4A~4B
AI summary
There is provided a device and a method for detecting exit of a person from a room, the device comprising: means for detecting door opening and closing; movement detection means for detecting movement in the room; and a processing circuitry configured to initiate processing of measurement data from the movement detection means as a response to detecting the door closing, and to cause an output of a message concerning the processing of said measurement data.