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A tactile sensor based on thin-plate deformation

Published online by Cambridge University Press:  09 March 2009

R.E. Ellis ,
S.R. Ganeshan  and
S.J. Lederman
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Summary

Traditionally, tactile sensors have been designed using compliant, rubber-like materials; when such a sensitized gripper grasps or otherwise manipulates an object, the normal strain deformation in the compliant material is sampled. The resulting information can be used to deduce simple local geometry of the contact, but the transduction process does not typically permit use of the individual strains in determining large-scale properties of the object (e.g., the inertia). Measurements of inertial parameters of grasped objects require accurate, low-hysteresis transduction that few tactile sensors currently provide.

An alternative is to work from the task specification, and determine the tactile information that is necessary to accomplish the task. Here, we consider how to sense the length and mass of a uniform object that is gripped in a gravitational field, and show the design and assessment of a new kind of tactile sensor that is based on the theory of the deformation of thin plates. Features of this design include its potentially rugged realization, and its high-accuracy measurement that is more typical of force sensors than of tactile sensors.

Keywords

Tactile sensorThin-platē deformationHigh accuracy.
Type
Article
Information
Robotica , Volume 12 , Issue 4 , July 1994 , pp. 343 - 351
Copyright
Copyright © Cambridge University Press 1994

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