Skin-Mounted Sweat Sensor

Back to all technologies
Download as PDF
The state of hydration in humans is a delicate physiological parameter with direct effects on body function at the cellular, organic, and systemic levels. Studies have shown that deviations as small as 2 percent lower than normal can reduce cognitive and physical performance by more than 30 percent. Unfortunately, monitoring and maintaining hydration can be difficult. Methods of analyzing these levels vary between serum ion concentration, urine color, and body mass. Body mass and urine analysis are the more conventional techniques, but lack accuracy due to measurement shortcomings.

Researchers at Purdue University have developed a colorimetric dermal patch that measures human hydration by collecting and measuring sweat secretion over small areas of skin. Since most water loss in humans occurs via sweat, this method provides the most accurate analysis of hydration. The device consists of an inexpensive, laser-patterned filter paper sandwiched between two medical grade films, OpSite*. The filter paper contains a water-activated dye that provides an identifiable color change depending on moisture loss from small areas of skin. It is user friendly and easily identifies levels of moisture loss.

-User friendly

Potential Applications:
Oct 2, 2017
Utility Patent
United States
Sep 15, 2020

Aug 10, 2020
CON-Gov. Funding
United States

Oct 2, 2016
United States
Purdue Office of Technology Commercialization
The Convergence Center
101 Foundry Drive, Suite 2500
West Lafayette, IN 47906

Phone: (765) 588-3475
Fax: (765) 463-3486