Spiral-shaped piezoelectric sensors for Lamb waves direction of arrival (DoA) estimation

被引：14
作者：
De Marchi, L. [1 ]
Testoni, N. [1 ]
Marzani, A. [2 ]
机构：
[1] Bologna Univ Bologna, Dept Elect Elect & Informat Engn DEI, Viale Risorgimento 2, I-40136 Bologna, Italy
[2] Bologna Univ Bologna, Dept Civil Chem Environm & Mat Engn DICAM, Viale Risorgimento 2, I-40136 Bologna, Italy
来源：
SMART MATERIALS AND STRUCTURES | 2018年 / 27卷 / 04期
关键词：
Acoustic source location; piezoelectric transducers; Lamb waves; Radon transform; COMPOSITE STRUCTURES; ACOUSTIC TRANSDUCER; IMPACT DETECTION; IDENTIFICATION; LOCATION; SYSTEM; DAMAGE; ROSETTES; PLATES; PANELS;
D O I：
10.1088/1361-665X/aab19e
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
A novel strategy to design piezoelectric sensors suited for direction of arrival (DoA) estimation of incoming Lamb waves is presented in this work. The designed sensor is composed by two piezoelectric patches (P1, P2) bonded on the structure to be inspected. In particular, by exploiting the Radon transform, the proposed procedure computes the shape of P2 given the shape of P1 so that the difference in time of arrival (DToA) of the Lamb waves at the two patches is linearly related to the DoA while being agnostic of the waveguide dispersion curves. With a dedicated processing procedure, the waveforms acquired from the two electrodes and digitized can be used to retrieve the DoA information. Numerical and experimental results show that DoA estimation performed by means of the proposed shaped transducers is extremely robust.
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页数：10
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