A Portable Human Skin Tester Based on Resistance and Capacitance Measurement

Bin Yang; Yong Gui Dong

doi:10.4028/www.scientific.net/AMR.1035.401

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1035A Portable Human Skin Tester Based on Resistance...

A Portable Human Skin Tester Based on Resistance and Capacitance Measurement

Abstract:

A portable tester for accessing the electrical properties of human skin surface is reported. A pair of interdigital electrodes (IDE) that contact directly with the human skin, is used as the sensing element. The impedance of the sensing system is modeled as a resistance and a capacitance in series. A square wave signal is applied so that impedance of the IDE is measured in a charging/discharging way. The response voltages of the IDE at two excitation frequencies, 10 kHz and 600 Hz, are measured successively during one measurement cycle. Since the equivalent capacitance of skin performs different frequency-dependent property other than the resistance, their values can be resolved from the measured response voltages. A microprocessor-based system is implemented as a prototype battery-powered portable unit for household measurements. Good repeatability and satisfied accuracy have been obtained by experimental results.

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Proceedings of 2014 International Conference on Material Science and Engineering

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Periodical:

Advanced Materials Research (Volume 1035)

Pages:

401-407

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1035.401

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Online since:

October 2014

Authors:

Bin Yang, Yong Gui Dong*

Keywords:

Interdigital Electrodes, Skin Capacitance, Skin Resistance, Square Wave

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