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Journal of Biomedical Optics

Novel approach to assess the emissivity of the human skin
Author(s): Francisco J. Sanchez-Marin; Sergio Calixto-Carrera; Carlos Villaseñor-Mora
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Paper Abstract

To study the radiation emitted by the human skin, the emissivity of its surface must be known. We present a new approach to measure the emissivity of the human skin. Our method is based on the calculation of the difference of two infrared images: one acquired before projecting a CO2 laser beam on the surface of the skin and the other after such projection. The difference image contains the radiation reflected by the skin, which is used to calculate the emissivity, making use of Kirchhoff's law and the Helmholtz reciprocity relation. With our method, noncontact measurements are achieved, and the determination of the skin temperature is not needed, which has been an inconvenience for other methods. We show that it is possible to make determinations of the emissivity at specific wavelengths. Last, our results confirm that the human skin obeys Lambert's law of diffuse reflection and that it behaves almost like a blackbody at a wavelength of 10.6 μm.

Paper Details

Date Published: 1 March 2009
PDF: 6 pages
J. Biomed. Opt. 14(2) 024006 doi: 10.1117/1.3086612
Published in: Journal of Biomedical Optics Volume 14, Issue 2
Show Author Affiliations
Francisco J. Sanchez-Marin, Ctr. de Investigaciones en Óptica, A.C. (Mexico)
Sergio Calixto-Carrera, Ctr. de Investigaciones en Óptica, A.C. (Mexico)
Carlos Villaseñor-Mora, Ctr. de Investigaciones en Óptica, A.C. (Mexico)


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