Abstract
Fluid balance is important for a healthy human being. In this paper, a method to measure hydration status was developed and tested towards non-invasive measurement from human skin. Measurement of hydration status was performed by a microwave sensor utilizing a complementary split ring resonator (CSRR). The sensor was modeled, manufactured and then characterized by measuring tailor made skin phantoms based on the realistic electrical properties of skin with different degrees of hydration status. Qualitative longer term (>24 h) evaluation of the sensor was also performed by measuring polyester tissue that was drying over the time. Hydration status, represented by dehydrated, normal and hydrated skin phantoms, based on polyurethane with carbon and ceramic additives, was measured successfully by monitoring the changes in resonance frequency around 5.52 GHz. All results were compared to the dielectric reference measurements done by a commercial laboratory instrument.
Highlights
T HE human body contains large amounts of water depending on individual characteristics such as age and gender
The value for normal skin was acquired from reference [31]
The results show that there is a clear correlation between the measured resonance frequency and the measured dielectric properties
Summary
T HE human body contains large amounts of water depending on individual characteristics such as age and gender. Water content is high in the blood (blood cells and plasma) and blood circulation is responsible for distributing and regulating the water to different locations in the body [2], [3]. More than half of the water loss takes place through urination, smaller portions through the skin (evaporation and sweating) and via the lungs (exhaling), saliva, and the remainder is lost through the intestinal canal (feces). Factors such as Manuscript received August 14, 2019; revised October 1, 2019; accepted October 2, 2019.
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