For the investigations, a two-micrometre-thick polymer film consisting of a total of four layers was applied to the fingertip. The first layer consists of polyurethane nanofibres, which acts as a passivation and support layer. This is followed by an ultra-thin layer of gold, an intermediate layer of polyurethane nanofibres coated with parylene and finally another layer of gold.
The effect of the sensor on human sensation was investigated with the help of 18 test participants. Their data confirmed that the sensors were imperceptible and would neither affect their ability to grasp objects via friction nor their perceived sensitivity if the same task had been performed without a sensor attached.
“This measurement sensor is now a new tool that we can use for studying neuroscience and motor control. Previous tools either affected human sensation or required rigid objects. Now, we can investigate what happens during natural movements when, for example, you want to find out how ripe a tomato is. We can gather accurate information and document the exact pressure exerted by the fingers or fingertips,” explains Prof. Franklin.
To the homepage of the Associate Professorshop of Neuromuscular Diagnostics
Contact:
Prof. Dr. David Franklin
Associate Professorship of Neuromuscular Diagnostics
Georg-Brauchle Ring 60/62
80992 München
phone: 089 289 24583
e-mail: David.Franklin(at)tum.de
Text: Romy Schwaiger
Photo: Someya-Yokota-Lee Group/The University of Tokyo