Wearable Light Guide Skin Contact Detection for Sensor Activation
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Solution Overview
Problem
Wearable devices often experience inaccurate physiological data readings due to poor skin contact, air gaps, and contaminants, leading to increased power consumption and decreased battery life.
Innovation Solution
Incorporating a light guide apparatus with light sources and detectors to determine skin contact by measuring the amount of light that escapes, allowing for the activation or deactivation of sensors and alerting the user to improve contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors continuously collect physiological data, then data availability is improved, but power consumption increases
Solution Approach 1:
The system uses periodic wear state detection through light guide apparatus instead of continuous monitoring. Sensors are activated in cycles based on detected wear state changes, allowing physiological data collection only when the device is properly worn, thus reducing overall power consumption while maintaining data availability during active periods
Solution Approach 2:
The light guide apparatus automatically detects skin contact and triggers sensor activation without user intervention. The system self-regulates sensor operation based on real-time wear detection, enabling data collection only when conditions are optimal, thereby reducing unnecessary power consumption while ensuring data availability when the device is actually worn
2Measurement precision
If sensors operate continuously to ensure data accuracy, then measurement precision is improved, but battery life decreases
Solution Approach 1:
Sensors operate periodically based on wear detection cycles rather than continuously. The light guide apparatus periodically checks skin contact conditions and activates sensors only during confirmed wear periods, ensuring measurement precision when data collection occurs while extending battery life through reduced operational duration
Solution Approach 2:
The system implements feedback control where light guide detection results directly control sensor activation. When skin contact is detected, sensors are activated to ensure accurate measurements; when contact is lost, sensors are deactivated. This feedback mechanism guarantees measurement precision during active periods while conserving battery energy during inactive periods
3Measurement precision
If the device monitors wear state continuously, then measurement accuracy is improved, but energy consumption increases
Solution Approach 1:
The light guide apparatus performs wear state detection periodically rather than continuously. By checking skin contact at regular intervals and activating sensors only when wear is detected, the system maintains accurate contact detection when needed while significantly reducing energy consumption during non-wear periods
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
This approach enhances the accuracy of physiological data measurements, reduces power consumption, and extends battery life by ensuring proper skin contact and optimizing sensor usage.
Implementation Method 1
direct light from light sources to detectors using one or more light guides
Implementation Method 2
measure an amount of light that escapes from the light guide
Data Source
AI summary
Methods, systems, and devices for wearing detection are described. A method may include directing light from a light source to a detector using an optical light guide of the wearable device, where the optical light guide includes an optical interface configured to allow at least a portion of the directed light to escape the optical light guide based on a refractive property of a material contacting the optical interface. The method may include measuring, via the detector, an amount of escaped light which escaped the optical light guide, where the amount of escaped light is indicative of a level of surface contact at the optical interface of the optical light guide. The method may further include controlling an activation of one or more sensors of the wearable device based on the amount of escaped light.