Sleep Posture Detection with Single-Pixel Thermopile Signals
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Solution Overview
Problem
Existing sleep posture monitoring technologies, such as camera-based systems and wearable accelerometers, raise privacy and cost concerns, while simpler sensors like Single Pixel Thermopiles and PIRs suffer from limited accuracy and resolution, making it challenging to effectively determine sleep postures.
Innovation Solution
A system utilizing low-cost sensors like Single Pixel Thermopiles and PIRs to detect transition events between sleep postures by measuring temperature changes, combined with machine learning models to classify these events, and determine sleep postures based on time-series signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camera-based systems are used for monitoring sleep postures, then measurement precision is improved, but device complexity and privacy concerns increase
Solution Approach 1:
The patent extracts only the essential thermal signal information from the complex electromagnetic spectrum, using a single-pixel thermopile sensor to detect temperature changes associated with sleep posture transitions. This selective extraction avoids the complexity of full camera systems while retaining sufficient accuracy for posture monitoring.
Solution Approach 2:
The patent replaces mechanical/optical detection systems (cameras) with a thermal detection system using a single-pixel thermopile sensor. This substitution eliminates the need for complex image processing while providing sufficient measurement precision through thermal signal analysis of body heat patterns.
2Measurement precision
If accelerometer-based wearable sensors are used, then measurement precision is improved, but ease of operation deteriorates due to obtrusiveness
Solution Approach 1:
The patent introduces an intermediary detection system - a single-pixel thermopile sensor positioned in the sleeping environment that passively measures thermal signals without requiring direct contact with the user. This intermediary approach eliminates the obtrusiveness of wearable accelerometers while maintaining measurement precision through non-invasive thermal detection.
3Measurement precision
If pressure sensors embedded in bedsheets are used, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a single-pixel thermopile sensor that is significantly cheaper than embedded pressure sensor systems. The sensor can be positioned in the sleeping environment without requiring integration into bedsheets or other expensive components, reducing deployment cost while maintaining adequate measurement precision for posture monitoring.
4Device complexity
If simple sensors like Single Pixel Thermopile are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining a set of reference sleep postures and their corresponding thermal signatures. The single-pixel thermopile sensor detects temperature patterns that are compared against these pre-established references, enabling accurate posture identification without requiring complex real-time analysis capabilities.
Solution Approach 2:
The patent uses partial action by focusing the single-pixel thermopile sensor on specific thermal regions and time windows relevant to sleep posture transitions. Rather than attempting to capture all possible thermal data, the system concentrates measurement effort on the critical thermal signatures that distinguish between reference postures, achieving adequate precision with minimal sensor complexity.
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
Accurately determines sleep postures with reduced computational resources, providing alerts for undesirable postures and improving sleep quality assessment.
Implementation Method 1
one or more sensors from a plurality of sensors configured to measure a signal indicative of a motion of the user; Each single pixel thermopile sensor from the one or more sensors is configured to measure a temperature signal in its respective Field-of-View indicative of a motion of the user
Implementation Method 2
Simpler sensors like Single Pixel Thermopile (SPT) sensors, acoustic sensor, PIR sensors, etc., can be used for monitoring sleep postures
Data Source
AI summary
A system for determining a sleep posture of a user during a sleep session, the system comprising: one or more sensors from a plurality of sensors configured to measure a signal indicative of a motion of the user; and a controller configured to receive the signals from the one or more sensors indicative of a motion of the user; determine a turnover event from a predetermined plurality of reference turnover events based on the received signal; determine the sleep posture of the user from a predetermined plurality of reference sleep postures based on the turnover events.