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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Measurement of Radiative Properties of Scattering and Absorbing Layered Media

Takahiro Kono
Dep. of Mech. Eng. SIT, Tokyo, Japan

Jun Yamada
Dep. of Mech. Eng. SIT, Tokyo, Japan

DOI: 10.1615/IHTC15.rad.009126
pages 7295-7304


KEY WORDS: Radiation, Inverse problems, Measurement and instrumentation

Abstract

Many researchers have investigated the radiative properties of human skin in vitro and in vivo. The radiative properties in vivo provide critical information for the medical and cosmetics fields. Some authors have proposed a method for estimating the radiative properties in vivo. In these methods, the skin was assumed to be homogeneous. However, human skin has a layered structure, and these layers have different radiative properties. In this study, a numerical analysis was performed to clarify the effect of the layered structure having different radiative properties on the profile of the reflected radiation by changing the pitch of the stripe-like radiation as a parameter. The results showed that the profile of the reflected radiation with a narrower pitch is strongly affected by the extinction coefficient of the shallower layer of skin. This means that the extinction coefficient of each skin layer can be individually estimated by changing the pitch of irradiation. Therefore, we proposed a method for estimating the distribution of the extinction coefficient in the actual depth direction of the scattering and absorbing layered media in vivo by reflection profile measurements. In order to confirm the present method, we assumed that the skin is a two-layered structure and estimated the radiative properties of the skin in the visiblelight spectrum. Our results suggest that this new method has the possibility of measuring the distribution of the extinction coefficient in the actual depth direction for layered media in vivo.

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