Local strain distribution imaging using terahertz time‐domain spectroscopy

IF 1.8 3区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Strain Pub Date : 2022-06-27 DOI:10.1111/str.12425

Luis M. Reig Buades, S. Karmarkar, A. Dhiman, V. Tomar

引用次数: 0

Abstract

In this work, terahertz time‐domain spectroscopy (THz TDS) was applied to monitor strain distribution as a function of mechanical loading through a passive composite sensor. The composite sensor was made up of strontium titanate (STO) particles. Strain distribution was measured by analysing the change in THz pulse amplitude while it passes through the composite sensor. The change in THz pulse amplitude is related to change in dielectric permittivity. The change in dielectric permittivity induced in the STO composite layer due to deformation leads to a change in the time of arrival (ToA) of the electromagnetic pulse (EMP) in THz band. This change in the sub‐millimetre domain is correlated to the strain and can be mapped for reproducing strain distribution around different geometries. The measurements of strain mapping are compared with finite element simulations and digital image correlation (DIC) measurements, showing similar strain contours.

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利用太赫兹时域光谱进行局部应变分布成像

在这项工作中，太赫兹时域光谱(THz TDS)通过被动复合传感器应用于监测应变分布作为机械载荷的函数。该复合传感器由钛酸锶(STO)颗粒组成。通过分析太赫兹脉冲通过复合传感器时振幅的变化来测量应变分布。太赫兹脉冲幅度的变化与介电常数的变化有关。在STO复合材料层中，由于变形引起介电常数的变化，导致电磁脉冲在太赫兹波段的到达时间(ToA)发生变化。亚毫米域的这种变化与应变相关，可以通过映射来再现不同几何形状周围的应变分布。将应变映射测量结果与有限元模拟和数字图像相关(DIC)测量结果进行了比较，得到了相似的应变轮廓。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Strain 工程技术-材料科学：表征与测试

CiteScore

4.10

自引率

4.80%

发文量

期刊介绍： Strain is an international journal that contains contributions from leading-edge research on the measurement of the mechanical behaviour of structures and systems. Strain only accepts contributions with sufficient novelty in the design, implementation, and/or validation of experimental methodologies to characterize materials, structures, and systems; i.e. contributions that are limited to the application of established methodologies are outside of the scope of the journal. The journal includes papers from all engineering disciplines that deal with material behaviour and degradation under load, structural design and measurement techniques. Although the thrust of the journal is experimental, numerical simulations and validation are included in the coverage. Strain welcomes papers that deal with novel work in the following areas: experimental techniques non-destructive evaluation techniques numerical analysis, simulation and validation residual stress measurement techniques design of composite structures and components impact behaviour of materials and structures signal and image processing transducer and sensor design structural health monitoring biomechanics extreme environment micro- and nano-scale testing method.