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KMID : 0604520160420020103
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Journal of the Society of Cosmetic Scientists of Korea
2016 Volume.42 No. 2 p.103 ~ p.109
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A Study on Skin Status with Acoustic Measurements of Skin Friction Noise
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Chang Yun-Hee
Seo Dae-Hoon
Koh A-Rum
Kim Sun-Young
Lim Jun-Man
Han Jong-Sub
Park Sun-Gyoo
Kim Yang-Han
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Abstract
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Efficacy of cosmetics has been mainly evaluated by qualitative and quantitative methods based on visual sense, tactile sense and skin structure until now. In this study, we suggested a novel evaluation method for skin status based on sound; measuring and analyzing the rubbing noise generated by applying cosmetics. First, the rubbing noise was measured at a close range by a high-sensitivity microphone in anechoic environment, and the noises were analyzed by 1/3 octave band analysis in frequency-domain. Three conditions, 1) before washing, 2) after washing and 3) after application of cosmetics, were compared. As a result, sound pressure level (SPL) of rubbing noise after washing was larger than that of before washing, and the SPL of rubbing noise after cosmetic application was the smallest. Furthermore, the energy of rubbing noise after application was higher than that of the before and after washing conditions in a low frequency band (lower than 2 kHz region). Conversely, the energy of rubbing noise after application was much lower than the others in a high-frequency band (upper than 2 kHz region). This change of energy distribution was described as a balloon-skin model. High SPL in the low frequency region after the cosmetic applications was due to the increase of “flexibility index”, while SPL in the high frequency region significantly decreased because of the attenuation which is related to “softness index”. Therefore, we developed two indices based on the spectrum-energy difference for evaluating skin conditions. This proposed method and indices were verified via skin flexibility and roughness measurement using cutometer and primos respectively. These results suggest that acoustic measurement of skin friction noise may be a new skin status evaluation method.
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KEYWORD
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friction noise, rubbing noise, 1/3 octave analysis, sound pressure level, sound quality
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