Wearable Sensor Threads with Optical Dyes for Humidity-Resistant Analyte Detection
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Solution Overview
Problem
Existing sensors for detecting fluid-borne analytes, such as electrochemical sensors, are prone to humidity and signal drift, while optical sensors require a light source, limiting their effectiveness in various applications.
Innovation Solution
A wearable sensor system featuring threads coated with optically-responsive chemical dyes entrapped in a polymer matrix, which change color upon exposure to specific analytes, allowing for detection without the need for a light source and providing stability across different environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrochemical sensors are used to detect analytes, then detection capability is provided, but the sensors are prone to humidity and signal drift
Solution Approach 1:
The patent replaces electrochemical detection with optical detection using color-changing dyes. The optical system uses visible color changes rather than electrical signals, eliminating the harmful effects of humidity and signal drift that plague electrochemical sensors. The dye-based optical detection method is inherently more stable in humid environments.
Solution Approach 2:
The patent introduces a polymer coating as an intermediary layer between the dye and the environment. This coating protects the dye from direct exposure to humidity while still allowing analyte interaction, thereby reducing humidity interference while maintaining detection capability.
2Reliability
If optical sensing is used to avoid electrochemical sensor difficulties, then reliability is improved, but a light source is required
Solution Approach 1:
The patent employs dyes that undergo spontaneous color changes in response to analyte exposure without requiring external light sources. The dyes inherently provide their own optical response through chemical reactions, eliminating the need for complex light source components and making the system self-sufficient.
Solution Approach 2:
The patent directly utilizes color-changing dyes as the sensing mechanism. The dyes change color in response to analyte binding, providing a visible optical signal that can be detected without additional light sources or complex optical equipment, thereby maintaining reliability while reducing device complexity.
3Measurement precision
If dyes are exposed directly to analytes, then detection sensitivity is high, but dye stability decreases
Solution Approach 1:
The patent introduces a polymer coating as an intermediary layer between the dye and the analyte environment. This coating allows analytes to interact with the dye for detection while protecting the dye from degradation by humidity, oxygen, and other environmental factors, thereby maintaining both sensitivity and stability.
Solution Approach 2:
The patent uses a thin polymer coating film to encapsulate the dye. This flexible film provides protection while maintaining permeability to analytes, allowing the dye to remain stable yet responsive to target analytes for sustained detection performance.
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 sensor system effectively detects a range of analytes, including gases and vapors, with improved stability and sensitivity, enabling environmental monitoring and potential use in health, safety, and security applications.
Implementation Method 1
Each of the threads has an optically-responsive chemical dye entrapped thereon. These dyes are selected to change color upon exposure to the particular analyte whose presence is to be detected.
Implementation Method 2
These dyes are selected to change color upon exposure to the particular analyte whose presence is to be detected. The threads themselves can be made from a variety of materials. In some embodiments, the threads are made of a natural fiber.
Data Source
AI summary
A wearable sensor has threads that are coated with a polymer coating. Each thread has an optically-responsive chemical dye entrapped thereon. Each of the dyes is selected emit electromagnetic radiation upon exposure to a selected analyte.