Conference Contribution Details


Wei Pan, Xu Zhang, Elena Chirikhina & Perry Xiao
Poster Presentation, SCC Annual Scientific Meeting & Technology Showcase, New York 2014.



Capacitive silicon fingerprint sensors, originally designed for biometric applications, have shown potential for contact imaging of skin properties including hydration, micro-relief analysis and solvent penetration measurements.

The poster will describe a study of skin hydration measurement using a commercial contact imaging system, the Epsilon™ (Biox Systems Ltd, England). The Epsilon™ differs from other such systems (SkinChip, L’Oréal, France; MoistureMap, CK Technology sprl, Belgium) in its calibrated, linear response to near-surface dielectric permittivity. The linear response is important because hydration is linearly related to permittivity. The calibration ensures consistency from instrument to instrument and from time to time.

The study includes a correlation with comparable Corneometer (Courage + Khazaka GmbH, Germany) readings and a detailed description of how the contact images can be captured and processed to reduce systematic measurement errors associated with native, non-linear fingerprint sensor response, inconsistent contact, hair, micro-relief, wrinkles and surface water from imperceptible perspiration.


Click here to download the poster handout (pdf format, 0.9MByte).