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8 April 2008 Numerical and experimental study of a three-axis optical tactile sensing system
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In this study, we investigated a promising method for measuring three-axis force based on an optical tactile sensing system. Such system consists of a waveguide, an array of tactile cell, a light source and an image sensor (a CCD camera). When the tactile cells are subjected to external forces, the condition for total internal reflection of the attached waveguide is spoiled. The original symmetrical planar waveguide then changes to an asymmetrical one, leading to light leakage in the transverse direction, which is used as the sensing mechanism for the applied forces. A numerical study involving three-dimensional finite element analysis was carried out to study the deformation of tactile cells due to contact forces. A linear relationship between the applied three-axis force and the spot sizes of the image of the leaked light was obtained and validated by experiments.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jiamin Liu, Qi Yang, Tianwei Ma, and Yingjun Pan "Numerical and experimental study of a three-axis optical tactile sensing system", Proc. SPIE 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008, 69321B (8 April 2008);

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