Abstract
An optical approach to determine the hydration level in human skin is presented. The approach is based on temporal tracking of back-reflected secondary speckle patterns generated while illuminating the tested area with a laser and applying periodic vibrations to the surface via a controlled vibration source (CVS). This approach has already been tested successfully for other biomedical parameters such as sensing vital signs, hematology and hemodynamic processes in the body. In this paper we examine and adjust this optical technique with the aim of measuring human skin moisture. We compare the suitability and accuracy of our optical method to the commercially available device for skin moisture measurements, the Corneometer CM 825 (by Courage + Khazaka, Cologne, Germany). Preliminary experiments showing the method's suitability for hydration measurements are presented, may lead to more accurate results that may upgrade the control of the cosmetic industry as well as identifying symptoms of moisture-related skin diseases.
Highlights
Hydration measurement of human skin is one of the basic measurements in bio-medical and cosmetic applications, giving us an important information about the biophysical state of our skin [1]
How does the parameter obtained from our optical system relate to a measure of skin moisture at a given moment? To answer this question, this section will describe how frequency amplitude can be considered as proportional to the attenuation resulting from skin moisture status
All statistical tests we performed showed that our optical system identifies different moisture conditions as identified by the Corneometer
Summary
Hydration measurement of human skin is one of the basic measurements in bio-medical and cosmetic applications, giving us an important information about the biophysical state of our skin [1]. The epidermis consists of skin cells that are bonded to each other by the help of inter-cellular material consisting of NMFs - natural moisturizers These are molecules such as - sugars, salts, amino acids - that hold water. Since the behavior of an acoustic wave in biological tissue can provide us information about the mechanical characteristics of the tissue (such as the hydration level), we can combine our proven analysis technique with the physical meaning of acoustic wave propagation to distinguish between wet and dry tissue This innovative method of measuring skin moisture, may even progress to distinguish between different amounts of moisture. The results may offer a new way to scientifically compare between various cosmetic products or even evolve to identify skin pathologies
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