Sensing Performance of Multi-Channel RFID-based Finger Augmentation Devices for Tactile Internet

TL;DR

This paper evaluates a multi-channel RFID finger device for tactile internet applications, showing it improves reliability and accuracy in dielectric sensing over single-channel systems through experimental validation.

Contribution

It introduces a multi-channel RFID finger augmentation device and demonstrates its enhanced dielectric sensing performance and reliability compared to single-channel sensors.

Findings

Achieves 100% reliability in on-hand communication for touched objects.

Halves measurement uncertainty compared to single-channel devices.

Effectively discriminates among low-, medium-, and high-permittivity materials.

Abstract

Radiofrequency finger augmentation devices (R-FADs) are a recently introduced class of epidermal radiofrequency identification (RFID) sensor-tags attached to the fingers, communicating with a body-worn reader. These devices are promising candidates to enable Tactile Internet (TI) applications in the short term. R-FAD based on auto-tuning RFID microchips can be used as dielectric probes for the material of touched objects. However, due to the nearly unpredictable intrinsic variability of finger-object interaction, a single sensorized finger (single-channel device) is not enough to guarantee reliable data sampling. These limitations can be overcome by exploiting a multi-channel R-FAD sensorizing multiple fingers of the hand. In this paper, the dielectric-sensing performance of a multi-channel R-FAD, composed of sensors encapsulated into soft elastomers, is numerically and experimentally characterized, involving a set of volunteers. The inter-sensor coupling is negligible, thus enabling simultaneous independent dielectric measurements. The multi-sensor configuration allows for 100% reliability of the on-hand communication link for touched objects in a wide range of permittivity. Experiments moreover demonstrate that multi-channel measurements can halve the measurement uncertainty of the single-channel case. The achievable precision is suitable to discriminate among low-, medium-, and high-permittivity materials.