Garment-Integrated Microwave Sensor for Sweat Detection

This study presents a garment-integrated resonant microwave sensor for real-time sweat detection. By measuring the resonance frequency, the sensor detects varying moisture levels within fabrics, offering a reliable approach for garment moisture due to body sweating. The design separates the sensor tag from the reader, allowing a wireless sensing. When tested at room temperature, the sensor demonstrated a significant pole resonance frequency shift from <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$378 \mathbf{M H z}$</tex> to <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$258 \mathbf{M H z}$</tex> upon the absorption 0.5 mL of water in the fabric, with a direct predictable correlation with moisture content. This trend underscores the sensor's potential for precise, non-invasive sweat sensing within a wearable platform.