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Detection of object contact during grasp using nail-mounted strain sensors

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2 Author(s)
Grill, W.M. ; Dept. of Biomed. Eng., Case Western Reserve Univ., Cleveland, OH, USA ; Van Doren, C.L.

A strain gage glued to the thumbnail was evaluated as a sensor of contact between the thumb and a grasped object. Subjects grasped, lifted, and released a set of standard objects, and the output of the strain gage was amplified in a bridge configuration. The strain signal was high pass filtered, and an amplitude threshold was used to detect contact. Across 3 subjects and 6 objects, contact was detected correctly in 85% of trials. A large number of false positives were also detected, primarily due to object release. This approach has the advantage that it does not interfere with grasp, and these results demonstrate that a nail mounted strain gage can be used to detect object grasp

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Engineering in Medicine and Biology Society, 1997. Proceedings of the 19th Annual International Conference of the IEEE  (Volume:5 )

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