Understanding the effects of topography on skin moisturization measurement via 2 dimensional capacitance imaging

Abstract

Objective

Methods which assess skin moisturization based on changes in its electrical properties are widely used in both cosmetic and medical research industries. However the devices themselves often give results which are significantly different to each other. Recently 2 dimensional imaging moisturization systems have become commercially available, which have the capability to provide a more detailed assessment of what is contributing to measured skin moisturization. Presented here is a new in vitro method for preparing textured model test substrates for use with these devices, and results of their use to provide a clearer insight into the devices operation.

Methods

A variety of different textured model test substrates were measured using a commercially available skin moisturization measurement device, the Epsilon. The response of the Epsilon was also tested against conventional skin moisturization devices.

Results

Surface morphology of model test substrates was found to have a significant influence on the measurement of its electrical properties with both the conventional and 2 dimensional skin moisturization measurement devices. Through modification of the areas of the image being assessed for the 2 dimensional moisturization mapping device, the parts of the model test substrate in contact with the device were indentified and analysed separately to areas not in contact with the sensor. This provided a more robust assessment of the electrical properties of substrate itself, rather than being influenced by texture like the conventional skin moisturization measurement devices.

Conclusions

While the 2 dimensional moisturization mapping systems can be used like a conventional electrical skin measurement device giving a simple overall reading of skin moisturization for the test area, their true value over existing electrical measures comes from its ability to isolate the skin itself from areas which are not in contact with the sensor.

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