Abstract
A method to quantitatively evaluate the skin surface lipids by the use of a fiber-optic refractometer is described. The method exploits the fact that the skin surface lipids tend to make the light propagating inside the fiber core refracted into the surrounding medium thus decreasing the sensor output. The applicability of the sensor is examined by comparison with a traditional gravimetric technique using a balance. Optical measurement results obtained from the forehead of a volunteer are related to the results by gravimetry, which indicates there is a strong correlation between them. The practicality of the sensor is also confirmed by a bilateral symmetry test where data taken from both sides of the forehead are related, giving a correlation coefficient of 0.883.
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