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Sensors 2013, 13(6), 7104-7120; doi:10.3390/s130607104

A New Self-Calibrated Procedure for Impact Detection and Location on Flat Surfaces

GITERM. ETS I. Navales, Universidad Politécnica de Madrid, Arco de la Victoria 4, Madrid 28040, Spain
E.T.S.I. Industriales, Universidad de Castilla-La Mancha, Albacete 02071, Spain
Sensors and Actuators Group, Juan de Herrera 6, Madrid 28040, Spain
Author to whom correspondence should be addressed.
Received: 28 February 2013 / Revised: 27 May 2013 / Accepted: 29 May 2013 / Published: 30 May 2013
(This article belongs to the Special Issue Piezoelectric Sensors and Actuators)
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Many analyses of acoustic signals processing have been proposed for different applications over the last few years. When considering a bar-based structure, if the material through which the sound waves propagate is considered to be acoustically homogeneous and the sound speed is well known, then it is possible to determine the position and time of impact by a simple observation of the arrival times of the signals of all the transducers that are strategically disposed on the structure. This paper presents a generalized method for impact detection and location on a flat plate, together with a calibration procedure with which to obtain the sound speed from only one set of measurements. This propagation speed is not well known as a result of either imprecise material properties or the overlapping of longitudinal and transversal waves with different propagation velocities. The use of only three piezoelectric sensors allows the position and time of impact on the flat plate to be obtained when the sound speed is well known, while the use of additional sensors permits a larger detection area to be covered, helps to estimate the sound speed and/or avoids the wrong timing of difference measurements. Experimental results are presented using a robot with a specially designed knocking tool that produces impacts on a metallic flat plate. View Full-Text
Keywords: impact detection and location; acoustic wave propagation; robotic based experimental setup impact detection and location; acoustic wave propagation; robotic based experimental setup

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Somolinos, J.A.; López, A.; Morales, R.; Morón, C. A New Self-Calibrated Procedure for Impact Detection and Location on Flat Surfaces. Sensors 2013, 13, 7104-7120.

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