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This paper describes a novel stretchable fingernail sensor for measuring fingertip forces for human-computer interaction. The fingernail sensor uses photoplethysmography to measure the change in blood perfusion in the fingernail bed when the fingerpad touches a surface with various forces. The original fingernail sensor was rigidly attached to the human fingernail, necessitating a customized fabrication for each individual user. Using novel fabrication techniques, a new stretchable sensor hasdoi:10.1109/whc.2009.4810920 dblp:conf/haptics/Abu-KhalafPMM09 fatcat:thbivywr4nbybebqww22c5no2y