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首页> 外文期刊>Composite Structures >Performance of frequency and/or phase modulated excitation waveforms for optical infrared thermography of CFRPs through thermal wave radar: A simulation study
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Performance of frequency and/or phase modulated excitation waveforms for optical infrared thermography of CFRPs through thermal wave radar: A simulation study

机译：通过热波雷达对CFRP光红外热成像的频率和/或相位调制激励波形的性能：模拟研究

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摘要

Following the developments in pulse compression techniques for increased range resolution and higher signal to noise ratio of radio wave radar systems, the concept of thermal wave radar (TWR) was introduced for enhanced depth resolvability in optical infrared thermography. However, considering the highly dispersive and overly damped behavior of heat wave, it is essential to systematically address both the opportunities and the limitations of the approach. In this regard, this paper is dedicated to a detailed analysis of the performance of TWR in inspection of carbon fiber reinforced polymers (CFRPs) through frequency and/or phase modulation of the excitation waveform. In addition to analogue frequency modulated (sweep) and discrete phase modulated (Barker binary coded) waveforms, a new discrete frequency-phase modulated (FPM) excitation waveform is introduced. All waveforms are formulated based on a central frequency so that their performance can be fairly compared to each other and to lock-in thermography at the same frequency. Depth resolvability of the waveforms, in terms of phase and lag of TWR, is firstly analyzed by an analytical solution to the 1D heat wave problem, and further by 3D finite element analysis which takes into account the anisotropic heat diffusivity of CFRPs, the non-uniform heating induced by the optical source and the measurement noise. The spectrum of the defect-induced phase contrast is calculated and, in view of that, the critical influence of the chosen central frequency and the laminate's thickness on the performance of TWR is discussed. Various central frequencies are examined and the outstanding performance of TWR at relatively high excitation frequencies is highlighted, particularly when approaching the so-called blind frequency of a defect.
机译：在增加范围分辨率的脉冲压缩技术的发展之后，引入了热波雷达（TWR）的概念，以提高光红外热成像中的深度可解变。然而，考虑到热浪的高度分散和过度阻尼行为，必须系统地解决方法的机会和局限性。在这方面，本文旨在详细分析TWR在碳纤维增强聚合物（CFRP）的情况下通过激发波形的频率和/或相位调制进行检查。除了模拟频率调制（扫描）和离散相位调制（Barker二进制编码）波形之外，还引入了一种新的离散频相调制（FPM）激发波形。所有波形都基于中央频率配制，使得它们的性能可以相互比较并以相同的频率锁定热成像。首先通过对1D热波问题的分析解决方案分析波形的波形的深度可解变性，并进一步通过3D有限元分析，以考虑CFRP的各向异性热扩散性，这是非光源引起的均匀加热和测量噪声。讨论了缺陷诱导的相位对比度的光谱，鉴于该缺陷诱导的相位对比度，讨论了所选的中心频率和层压板在TWR性能上的厚度的临界影响。检查各种中央频率并突出显示，在相对高的激励频率下的TWR的出色性能，特别是当接近缺陷的所谓盲频时。

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  • 来源
    《Composite Structures》 |2019年第10期|111177.1-111177.11|共11页
  • 作者

    Hedayatrasa Saeid; Poelman Gaetan; Segers Joost; Van Paepegem Wim; Kersemans Mathias;

  • 作者单位

    Univ Ghent Dept Mat Text & Chem Engn Mech Mat & Struct UGent MMS Technol Pk Zwijnaarde 46 B-9052 Zwijnaarde Belgium|SIM Program M3 Detect IV Technol Pk Zwijnaarde 46 B-9052 Zwijnaarde Belgium;

    Univ Ghent Dept Mat Text & Chem Engn Mech Mat & Struct UGent MMS Technol Pk Zwijnaarde 46 B-9052 Zwijnaarde Belgium|SIM Program M3 Detect IV Technol Pk Zwijnaarde 46 B-9052 Zwijnaarde Belgium;

    Univ Ghent Dept Mat Text & Chem Engn Mech Mat & Struct UGent MMS Technol Pk Zwijnaarde 46 B-9052 Zwijnaarde Belgium;

    Univ Ghent Dept Mat Text & Chem Engn Mech Mat & Struct UGent MMS Technol Pk Zwijnaarde 46 B-9052 Zwijnaarde Belgium;

    Univ Ghent Dept Mat Text & Chem Engn Mech Mat & Struct UGent MMS Technol Pk Zwijnaarde 46 B-9052 Zwijnaarde Belgium;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Infrared thermography; Optical; Radar; Waveform; Pulse compression; CFRP; Composite;

    机译：红外热成像;光学;雷达;波形;脉冲压缩;CFRP;复合材料;

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