Comparison of a near-infrared reflectance spectroscopy system and skin conductance measurements for in vivo estimation of skin hydration: a clinical study

Inga Saknite orcid (Login required)
Biophotonics Laboratory, Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia

Aleksejs Zavorins
Faculty of Continuing Education, Riga Stradins University, Latvia

Ilona Zablocka
Faculty of Continuing Education, Riga Stradins University, Latvia

Janis Kisis
Department of Infectology and Dermatology, Riga Stradins University, Latvia

Janis Spigulis
Biophotonics Laboratory, Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia

Paper #3166 received 1 Mar 2017; revised manuscript received 26 Apr 2017; accepted for publication 26 Apr 2017; published online 28 Apr 2017.

DOI: 10.18287/JBPE17.03.010310


Diffuse reflectance spectroscopy system was developed for estimation of skin hydration in the near-infrared spectral range of 900-1700 nm. Experimental setup consisted of a near-infrared spectrometer, Y-type fiber optics probe with 1 detection and 6 illumination fibers, halogen-tungsten light source and a PC. By analyzing diffuse reflectance spectrum, a parameter representing skin hydration by performing baseline correction and calculating the area under the 1450 nm water absorption maximum is proposed. A clinical study was performed acquiring data of skin hydration of 39 patients' forearm skin. Results of the developed system are compared to results obtained by a commercial device based on skin conductance measurements.


Diffuse reflectance; near-infrared; spectroscopy; water; absorption; hydration; skin

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