This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: A novel pressure array sensor based on contact resistance variation: Metrological properties Z. Del Prete, L. Monteleone, a) and R. Steindler Department of Mechanics and Aeronautics, University of Rome La Sapienza, Via Eudossiana 18, 00184 Roma, Italy ~ Received 2 August 2000; accepted for publication 20 November 2000 ! The working principle and the metrological performances of a novel array sensor devoted to pressure map measurements are experimentally analyzed here. The physical principle on which the sensor elements are sensitive to the pressure is the variation of the contact resistance. Pressure maps from 1 up to 500 kPa can be measured. The prototype here utilized for the metrological characterization has been an 8 3 8 matrix sensor with a 5 mm spatial resolution over both x and y direction and a total thickness of 150 m m. The materials that have been chosen to assemble the prototype yielded to a very flexible and robust sensor which can easily be fitted over round surfaces without being damaged or leading to an alteration of its measuring properties. The static and the dynamic metrological performances of the sensor that have been studied and discussed are the response function and the calibration curve, the repeatability, the sensitivity, the time drift, the hysteresis, and the dynamic response. In spite of its functional and constructive simplicity, the metrological performances the sensor has exhibited, together with its peculiar constructive feature, have indicated the possibility to utilize it to effectively measure pressure maps in every application for which the sensor could be shaped in. 2001 American Institute of Physics. @ DOI: 10.1063/1.1340561 # I. INTRODUCTION The study of pressure maps is a subject matter of great importance in many different fields as scientific measure- ment, biomedical research, and industrial application. In ro- botics, for example, it is very useful to know the force ap- plied by the pliers to assure a correct manipulation of objects or, there where artificial tactile organs are required, for the recognition and the distinction of shapes. In ergonomics the primary interest is to measure the pressure distribution and the overall force that is required to hold, for example, the handle of a tool or, may be, a doorknob. On the other side, during the rehabilitation practice involving functional elec- trical stimulation to obtain a partial grip restoration for quad- riplegic patients, the knowledge of the force produced by the fingers under electrical stimulation allows to dimension in the correct way the feedback system of the grasp itself, also with the aim to avoid unnecessary fatigue to the patient....
View Full Document
- Spring '08