研究目的
Investigating the development of a wireless, passive, conformable sweat sensor sticker for monitoring sweat loss volume and conductivity beneath garments, especially for individuals wearing thick personal protective equipment.
研究成果
The study presents a passive, wearable sweat rate and sweat conductivity sensor that can be measured wirelessly through clothing or PPE. The sensor demonstrates orthogonal response to conductivity and sweat rate, offering a simple solution for monitoring hydration status in harsh environments. Further work is needed to increase the sensor's frequency and amplitude response and to develop strategies for consistent reader-sensor orientation.
研究不足
The sensor's sensitivity to dielectric material proximity and orientation between reader and sensor affects its response. Calibration through different thicknesses and types of material is required before use. The study highlights the need for strategies to ensure consistent orientation between resonator and reader for accurate measurements.
1：Experimental Design and Method Selection:
The study involved designing a sweat sensor sticker with a laser-ablated microfluidic channel and a resonant sensor transducer. The sensor's response to sweat conductivity and volume was measured using a handheld vector network analyzer.
2：Sample Selection and Data Sources:
A sweat proxy was used to fill the channels for initial testing, followed by a four-person study to assess sensor variance due to local tissue dielectric heterogeneity and sensor-reader orientation.
3：List of Experimental Equipment and Materials:
The sensor was fabricated using PDMS for microfluidic chips and copper-coated polyimide for the resonant sensors. A craft laser cutter (GlowForge Plus) was used for laser ablation, and a portable vector network analyzer (MetroVNA) was used for wireless interrogation.
4：Experimental Procedures and Operational Workflow:
The sensor was tested with varying concentrations of NaCl solutions to mimic sweat conductivity. The effect of fluid filling on resonant frequency and transmission loss was measured, and the sensor's performance through thick PPE was evaluated.
5：Data Analysis Methods:
Data from the VNA scans were analyzed using custom Matlab code to fit quadratic models to the peak of the bode plot, reporting transmission loss magnitude and resonant frequency.
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