Multi-Zone Sensor System for Elderly Fall Detection
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Solution Overview
Problem
Existing monitoring systems for elderly individuals in home environments face issues such as sensors being inadvertently covered, leading to false negatives and failure to detect obstructions, and lack of alerts for items blocking the measurement range.
Innovation Solution
A sensor system comprising multiple detectors at different heights, including a third detector with a light source and phototransistor to detect obstructions, and a sound alarm system to notify of coverage or falls, allowing for real-time monitoring and alerting of potential hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single detector is used to monitor movement, then the device complexity is low, but the reliability deteriorates because the sensor can be easily covered by towels or clothing articles
Solution Approach 1:
The monitoring system is segmented into multiple independent detectors positioned at different heights (first detector for upper range, second detector for lower range). Each detector independently monitors its specific zone, so that coverage of one detector does not affect the others. This segmentation maintains detection reliability while keeping individual detector complexity low.
Solution Approach 2:
The system transitions from single-point detection to multi-level spatial detection by adding vertical dimensionality with detectors at different heights. The third detector adds another dimensional layer by monitoring for obstructions in the measurement path. This dimensional expansion ensures that coverage in one area does not compromise detection in other areas.
2Ease of operation
If sensors are installed on the floor or wall, then the ease of operation is good, but the object-affected harmful factors increase because towels or clothing can cover the sensors
Solution Approach 1:
Each detector is assigned a specific local monitoring zone (upper range for first detector, lower range for second detector). The third detector monitors a specific obstruction zone. By distributing detection functions across different local zones at different heights, the system maintains ease of installation while reducing the probability that a single item can cover all detection points.
Solution Approach 2:
The system adds vertical dimensionality by placing detectors at different heights rather than relying on a single horizontal plane. This multi-level arrangement ensures that items covering one level do not necessarily cover other levels, thereby reducing the harmful effect of sensor coverage while maintaining simple installation procedures.
3Loss of information
If traditional monitoring systems are used, then the device complexity is low, but the loss of information increases because the system cannot detect when sensors are covered
Solution Approach 1:
The third detector provides feedback about the presence of obstructions in the measurement path of the first and second detectors. When the third detector identifies an item blocking the measurement range, it triggers an alarm signal, providing real-time feedback about sensor coverage conditions. This feedback mechanism reduces information loss about sensor status while keeping the overall system relatively simple.
Solution Approach 2:
The third detector performs preliminary detection of potential obstructions before they can completely block the measurement ranges of the first and second detectors. By monitoring for items in advance, the system can issue early warnings and take preliminary actions to prevent complete detection failure, thereby reducing information loss about sensor coverage.
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 system effectively detects and alerts for sensor coverage and falls, ensuring continuous monitoring and prompt action can be taken to rectify obstructions, enhancing safety and reliability in elderly care settings.
Implementation Method 1
at least one means, such as a phototransistor or photodiode, converting light into an electrical signal
Implementation Method 2
the light coming from the light source is reflected to the means converting light into an electrical signal if an item is placed on top of the sensor and/or third detector
Data Source
AI summary
A sensor and system for observing the presence, location, movement and/or attitude of one or more objects to be monitored includes a sensor detecting presence, location, movement and/or attitude. The sensor includes two detectors, which are adapted to measure in two measuring ranges that are at a different height, of which the measuring range of the first detector is a lower measuring range and the measuring range of the second detector is an upper measuring range. The sensor further includes a third detector, which is adapted to detect an item, such as a towel or clothing article, placed in front of and/or on top of the first detector, second detector and/or third detector.