Kao Corporation, Beauty Research Center, Sumida Ward, Tokyo, Japan.
J Biomed Opt. 2011 Nov;16(11):117003. doi: 10.1117/1.3646208.
We have developed a simple and effective method for everyday measurement of translucency with a handy spectral reflectometer using edge loss. Edge loss can be used to quantify the translucency index in terms of changes in reflectance under two types of measurement conditions. Here, a measurement condition represents the pairing of an illumination area and a measurement area. As a measure of the degree of lateral spread of reflected light, the translucency index can influence the appearance of human skin because this index represents eventual translucency. First, we estimated how edge loss changes when measurement conditions are varied. We then selected the combination of two measurement conditions of large and small edge loss to minimize errors. Finally, we estimated actual skin translucency changes before and after treatments comprising acetone-ether immersion and ultraviolet irradiation. The results were qualitatively consistent with the expectations under variations in absorbance and scattering capacity, indicating the effectiveness of this method in evaluating translucency. This method allows simultaneous measurement of translucency and reflectance as a spectrum, and also appears applicable for daily use, although common optical parameters cannot be derived using this method alone.
我们开发了一种简单有效的方法，使用便捷的光谱反射仪通过边缘损耗来日常测量半透明度。边缘损耗可用于根据两种测量条件下反射率的变化来量化半透明度指数。在这里，测量条件代表照明区域和测量区域的配对。作为反射光横向扩展程度的度量，半透明度指数会影响人体皮肤的外观，因为该指数代表最终的半透明度。首先，我们估计了当测量条件变化时边缘损耗如何变化。然后，我们选择了大边缘损耗和小边缘损耗的两种测量条件的组合，以最小化误差。最后，我们估计了丙酮乙醚浸泡和紫外线照射处理前后的实际皮肤半透明度变化。结果与吸收和散射能力变化的预期定性一致，表明该方法在评估半透明度方面的有效性。该方法允许同时测量半透明度和反射率作为光谱，并且似乎也适用于日常使用，尽管仅使用这种方法无法得出常见的光学参数。
