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Sensors 2017, 17(11), 2686;

A Portable Stiffness Measurement System

Institute of Nano Science and Technology, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
Author to whom correspondence should be addressed.
Received: 30 September 2017 / Revised: 1 November 2017 / Accepted: 18 November 2017 / Published: 21 November 2017
(This article belongs to the Special Issue Tactile Sensors and Sensing)
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A new stiffness measurement method is proposed that utilizes the lateral deformation profile of an object under indentation. The system consists of a force measurement module between a pair of equidistant touch sensing modules. Unique feature of the method is that by adjusting the touch module separation, indenter protrusion, and spring constant of the force sensing module, one can choose a desired sensing range for the force module. This feature helps to enhance the stiffness differentiation between objects of similar hardness and avoids measurement saturation. We devised a portable measurement system based on the method, and tested its performance with several materials including polymer foams and human skin. View Full-Text
Keywords: stiffness measurement; Sneddon’s solution; portable system stiffness measurement; Sneddon’s solution; portable system

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Sul, O.; Choi, E.; Lee, S.-B. A Portable Stiffness Measurement System. Sensors 2017, 17, 2686.

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