Spectral analysis of ultrasonic signals backscartted by mortar: Effect of sand size and temperatures

IF 2.2 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters: X Pub Date : 2022-09-01 DOI:10.1016/j.mlblux.2022.100158

Hicham LOTFI , Bouazza FAIZ , Hicham MESBAH , Hicham BANOUNI

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引用次数: 1

Abstract

This paper presents results of application of Ultrasonic Waves UW in civil engineering. The measurement has been performed by ultrasonic reflection technique using a transducer with central frequency 0,5MHz. Several methods of analysis and signal processing have been applied to detect the position of reflections and to measure the time of flight between two echoes related to the reflection at the mortar interfaces. The experiments performed in the laboratory are carried to determine the ultrasonic velocity of the wave backscattered by samples. This allowed determining the ultrasonic velocity of UW in the mortar in order to deduce the durability of each mortar according to its microstructure. The objective is to make a comparative study of the various methods of analysis of the ultrasonic signals as: Continuous Wavelet Transform (CWT), Wigner Ville (WVD), Pseudo Wigner–Ville distribution (PWVD), Smoothed Pseudo Wigner–Ville Distribution (SPWVD) and Hilbert Transform (HT).

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砂浆后向散射超声信号的频谱分析：砂粒尺寸和温度的影响

本文介绍了超声波在土木工程中的应用成果。测量采用超声反射技术，使用中心频率为0.5 mhz的换能器。应用了几种分析和信号处理方法来探测回波的位置和测量与迫击炮界面处反射有关的两个回波之间的飞行时间。通过室内实验，确定了样品后向散射波的声速。这样就可以确定砂浆中UW的超声波速度，从而根据其微观结构推断出每种砂浆的耐久性。对连续小波变换(CWT)、Wigner Ville (WVD)、伪Wigner - Ville分布(PWVD)、平滑伪Wigner - Ville分布(SPWVD)和Hilbert变换(HT)等超声信号分析方法进行了比较研究。

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