On the measurement of frequency-dependent ultrasonic attenuation in strongly heterogeneous materials

被引：22

作者：

Molero, M. ^{[1
]}

Segura, I. ^{[2
]}

Aparicio, S. ^{[1
]}

Hernandez, M. G. ^{[1
]}

Izquierdo, M. A. G. ^{[3
]}

机构：

[1] CAEND CSIC, UPM, Madrid 28500, Spain

[2] Cartif Technol Ctr, Mech Engn Div, Valladolid 47151, Spain

[3] Univ Politecn Madrid, Dept SSR, Madrid 28040, Spain

来源：

ULTRASONICS | 2010年 / 50卷 / 08期

关键词：

Swept-frequency excitation; Frequency-dependent attenuation; Time-frequency filtering; Heterogeneous materials; WAVE-DISPERSION; TIME-FREQUENCY; MORTAR; PROPAGATION; FIELD;

D O I：

10.1016/j.ultras.2010.04.006

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

This paper deals with the measurement of frequency-dependent ultrasonic attenuation in strongly heterogeneous materials, such as cementitious materials. To improve the measurement of this parameter on this kind of materials, a linear swept-frequency signal is used to drive an emitter transducer to conduct a through-transmission inspection in immersion. To filter out undesirable frequency content, time-frequency filtering and detection process are performed. The use of this method has been compared with two excitation techniques, the broadband and the narrowband pulses. The results obtained using the swept-frequency excitation together with the time-frequency filtering, allows the determination of the attenuation curves with high accuracy over a wide frequency range without the need for complicated equipment, and improves the effective bandwidth by using a unique pair of transducers. (C) 2010 Elsevier B. V. All rights reserved.

引用

页码：824 / 828

页数：5

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