Wearable Sensor Intermittent Light Emission for Sleep State Detection
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Solution Overview
Problem
Existing sleep measurement devices require continuous sensor activation, leading to high battery consumption and delayed sleep result analysis, as they rely on post-processing methods and require expert polysomnography, limiting their usability and accuracy.
Innovation Solution
An electronic device equipped with movement and bio-sensors that determine sleeping stages in real-time, using a processor to analyze movement and bio-signals, and transmit control commands to adjust the operation of connected devices based on the user's sleeping state, thereby reducing power consumption and enabling immediate sleep analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are continuously activated during sleep measurement, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The processor controls the sensor to operate periodically rather than continuously. Specifically, the sensor is activated at predetermined intervals to capture sleep state data, then deactivated to conserve energy. This periodic operation maintains adequate measurement precision for sleep stage detection while significantly reducing power consumption compared to continuous activation.
2Device complexity
If post-processing method is used for sleep analysis, then device complexity is reduced, but loss of time increases
Solution Approach 1:
The processor performs preliminary analysis of sleep data during the sleep period itself, rather than waiting for post-processing. By continuously or periodically analyzing sensor data as it is collected and preparing sleep stage determinations in advance, the system can provide immediate sleep analysis results without requiring a separate post-processing phase, thus eliminating the 30-minute delay while maintaining processing simplicity.
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 device provides real-time sleep stage determination and efficient battery usage by intermittently emitting light for bio-signal measurement, allowing for immediate sleep analysis and convenient control of connected devices based on the user's sleeping state, enhancing user convenience and accuracy.
Implementation Method 1
The heartbeat sensor may be a sensor configured to emit light to generate a photoplethysmography (PPG) signal
Data Source
AI summary
A device includes a first sensor to generate a movement signal of a user movement; a second sensor to generate a PPG signal of the user; and a processor configured to set each of time periods as a predetermined amount of time to determine one sleeping state of the user, set a first part of the predetermined amount of time in each time period to emit the light, and set a remaining part of the predetermined amount of time in each time period to not emit the light, control the light emitter of the second sensor to emit the light in the first part of each time period and to not emit the light in the remaining part of each time period, and determine, for each time period, the sleeping state of the user based on the movement signal and the PPG signal that are generated for each time period.