Multi-Material Electrode Base Plate for Wearable Sensor Accuracy
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Solution Overview
Problem
Wearable electronic devices have limited surface areas for sensor arrangement, leading to inaccurate readings due to the heterogeneous nature of human skin and difficulty in determining core body temperature from extremity measurements.
Innovation Solution
A base plate with a larger surface area, formed from a thermally and electrically conductive material, acts as a multi-material electrode, incorporating transparent or semi-transparent materials to enable optical sensing and accommodate multiple sensors, allowing for improved temperature and biometric data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of the wearable device is increased to accommodate more sensors or larger sensor surfaces, then the measurement accuracy may be improved, but the device becomes less wearable and more cumbersome
Solution Approach 1:
The base plate is divided into multiple segments with different material properties (conductive regions for thermal/electrical sensing and transparent regions for optical sensing). This segmentation allows each region to perform its specialized function while maintaining a compact overall device structure that remains wearable.
Solution Approach 2:
The base plate utilizes composite materials combining transparent and conductive properties in different regions. This allows the device to achieve multiple sensing functions (optical and thermal/electrical) within a limited surface area, improving measurement accuracy without increasing device size.
2Measurement precision
If a single sensor is used to measure skin temperature, then the device complexity is reduced, but the measurement accuracy deteriorates due to localized skin temperature variations
Solution Approach 1:
The base plate serves multiple functions simultaneously: it acts as a thermal conduction path, an electrical conduction path, and an optical window. This multi-functionality allows a single base plate structure to enable multiple sensing modalities without requiring separate complex sensor arrangements for each function.
Solution Approach 2:
The invention transitions from point-contact temperature sensing to area-averaged temperature sensing by utilizing the extended surface area of the base plate. This dimensional change from 0D point measurement to 2D area measurement provides more representative skin temperature data while maintaining simple device architecture.
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 accurate averaging of skin temperature and enhances biometric data collection by accounting for skin heterogeneity, improving the effectiveness of wearable devices in health monitoring.
Implementation Method 1
The base plate may be formed from a thermally conductive material
Implementation Method 2
a transparent or semi-transparent material to enable optical sensing
Data Source
AI summary
Various embodiments provide a wellness tracking device with a base plate that may be utilized as a combination electrode by a variety of sensors. The base plate may be a multi-material electrode that includes a conductor and a transparent or semi-transparent material to enable optical sensing. In certain embodiments, the base plate supports a plurality of different sensors, which may selectively utilize the base plate as an electrode.