Conductive Thread-Based Textile Sensor for Continuous Perspiration Level Monitoring

Area of Science:

• Biomedical Engineering
• Textile Science
• Wearable Technology

Background:

• Perspiration monitoring is crucial for assessing physical status and comfort in fitness, athlete monitoring, and healthcare.
• Existing sweat sensors often restrict user mobility and comfort due to static requirements or direct skin adhesion.
• There is a need for unobtrusive and comfortable methods for continuous perspiration measurement.

Purpose of the Study:

• To develop and validate a novel conductive thread-based textile sensor for measuring on-cloth sweat quantity.
• To enable continuous and comfortable perspiration monitoring without restricting user mobility.
• To infer perceived perspiration levels from measured sweat quantity.

Main Methods:

• A novel sensor was designed using three conductive threads encased in braided cotton covers.
• The sensor was embedded in clothing, utilizing the change in conductivity (resistance) as sweat is absorbed by the cotton.
• A voltage dividing circuit measured resistance, and calibration mapped voltage to sweat quantity.

Main Results:

• The conductive thread-based textile sensor effectively measures on-cloth sweat quantity.
• Calibration successfully mapped sensor output (voltage) to electrolyte solution quantity.
• The system achieved an average prediction error of 0.4 levels for perceived perspiration.

Conclusions:

• The developed textile sensor offers a comfortable and mobile solution for continuous perspiration monitoring.
• This technology has potential applications in fitness tracking, athlete performance analysis, and patient/elderly care.
• The sensor provides a reliable method for inferring perceived perspiration levels from on-cloth sweat measurements.