Occupancy Detection via Accelerometer Vibration Analysis
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Solution Overview
Problem
Current methods for detecting occupancy in shared spaces are laborious, prone to error, costly, and ineffective for spaces without computers or specific types of seating, and existing solutions like video surveillance and pressure sensors lack precision and reliability.
Innovation Solution
An apparatus comprising an accelerometer unit, processor, and memory that continuously measures acceleration values to determine occupancy by generating movement signals based on predetermined limits, allowing for accurate detection of occupancy without continuous power consumption or complex setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video surveillance is used to count people, then occupancy detection is achieved, but the system becomes expensive and lacks precision
Solution Approach 1:
The patent replaces complex video surveillance systems with simple accelerometer-based detection devices attached to seats or workstations. These accelerometers detect mechanical vibrations caused by human presence, providing accurate occupancy detection at a fraction of the cost of video systems.
Solution Approach 2:
The invention changes the detection parameter from visual field analysis (video surveillance) to acceleration measurement. By attaching accelerometers to seats or workstations, the system detects occupancy through vibration patterns, eliminating the need for expensive cameras and complex image processing while improving precision through direct physical contact detection.
2Measurement precision
If pressure sensors are integrated into seats, then occupancy detection is achieved, but the system generates false positives and cannot distinguish between people and objects
Solution Approach 1:
The patent transitions from static pressure sensing to dynamic vibration analysis. Accelerometers detect the characteristic vibration patterns and movement signatures of human bodies, allowing the system to distinguish between living occupants and inanimate objects based on their dynamic mechanical properties rather than static weight alone.
Solution Approach 2:
The invention changes from measuring static pressure (which cannot distinguish between people and objects) to measuring dynamic acceleration and vibration characteristics. Human bodies produce distinctive vibration patterns through breathing, heartbeat, and movement that inanimate objects cannot replicate, thereby eliminating false positives.
3Loss of information
If continuous monitoring is implemented, then occupancy status is always known, but energy consumption increases
Solution Approach 1:
The patent implements periodic sampling of acceleration data rather than continuous processing. The system takes measurements at regular intervals, analyzes them to determine occupancy status, and enters low-power sleep modes between measurements, thereby maintaining occupancy information availability while dramatically reducing average power consumption.
Solution Approach 2:
The invention enables the detection device to autonomously manage its own power consumption by intelligently activating processing only when motion is detected or at scheduled intervals. The accelerometer continuously monitors in a low-power state and triggers full system activation only when occupancy status may have changed, allowing the device to service itself through intelligent power management.
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 reliable and cost-effective occupancy detection, reducing false positives and extending device longevity, enabling efficient management of shared spaces by accurately tracking equipment and room occupancy over time.
Implementation Method 1
an accelerometer unit in operation, continuously measuring an acceleration value of the equipment at each of a plurality of discrete time intervals
Data Source
Figure 1A~1B
Figure 2~3
Figure 4
AI summary
An apparatus (10) for detecting an occupancy of an equipment (12) by a person (14). A memory stores a status of the equipment as either occupied or unoccupied, and a predetermined acceleration limit value. An accelerometer unit communicates with the memory, and measures acceleration values of the equipment at discrete time intervals. The accelerometer unit compares each acceleration value to an acceleration limit value. If a consecutive number N of the acceleration values is greater than or equal to the acceleration limit value, the accelerometer unit generates a movement signal. A processor operates between an active mode when it receives the movement signal from the accelerometer unit, and an inactive mode. The processor in the active mode emits an occupied signal if the status of the equipment is unoccupied. A power source supplies electrical power to the accelerometer unit and to the processor.