PORTO @ Archivio Istituzionale della Ricerca

IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.

We present a robust and flexible tactile sensor based on piezoresistive sensing material, constituted by a polymeric composite with nanostructured spiky particles as filler. The composite is able to exploit tunneling conduction mechanism when subjected to a compressive load. We have here integrated this quantum tunneling composite (QTC) with an ad-hoc electronic read-out circuit. In addition a software interface can monitor and visualize the applied mechanical pressure, thus leading to a complete tactile sensor device. Concerning the sensing material, the piezoresistive composite shows an enhanced tunneling conduction due to the presence of nickel particles with nanostructured sharp tips embedded in a silicone matrix. We registered an increase up to nine orders of magnitude of the composite electrical conduction in response to a mechanical strain. The sensor consisted in a continuous layer of functional composite sandwiched between a matrix of patterned top and bottom electrodes. The planar sensor can thus be modeled as a two-dimensional array of resistors whose value decreases by increasing the applied pressure. We also designed an ad-hoc electronic read-out circuit, able to read and process the resistance variations of the sensor upon a compressive load, thus providing not only the pressure intensity but also the pressure distribution data. A software interface was able to achieve the real-time tridimensional response and lead to the visualization of the compressed regions on the sensor. The present device is an efficient and low-cost prototype of tactile sensing skin, thus readily enabling its use for human robotic applications.

Piezoresistive flexible composite for robotic tactile applications / Giancarlo Canavese;Stefano Stassi;Carmelo Fallauto;Simone Corbellini;Valentina Cauda;Vittorio Camarchia;Marco Pirola;Candido Fabrizio Pirri. - In: SENSORS AND ACTUATORS. A, PHYSICAL. - ISSN 0924-4247. - STAMPA. - 208(2014), pp. 1-9. [10.1016/j.sna.2013.11.018]

Powered by IRIS-about IRIS-Utilizzo dei cookie

 Copyright © 2022