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首页> 外文期刊>Optics and Lasers in Engineering >On the application of an optimized Frequency-Phase Modulated waveform for enhanced infrared thermal wave radar imaging of composites
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On the application of an optimized Frequency-Phase Modulated waveform for enhanced infrared thermal wave radar imaging of composites

机译：优化频相调制波形应用于复合材料增强的红外热波雷达成像

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摘要

Thermal Wave Radar (TWR) imaging employs the concept of pulse compression in order to obtain an increased probing depth and depth resolution in infrared thermographic testing of materials. The efficiency of the TWR imaging is highly dependent on the nature of the employed excitation signal. Most studies exploit the use of an excitation signal with an analogue frequency modulation (e.g. sweep signal) or a discrete phase modulation (e.g. Barker coded signal). Recently, a novel frequency-phase modulated (FPM) waveform was introduced, and computationally verified by the current authors, which couples the concept of frequency- and phase modulation to each other in view of obtaining an optimized excitation signal for improved TWR imaging.This paper experimentally investigates the performance of the novel optimized FPM waveform for the inspection of glass and carbon fiber reinforced polymer (GFRP and CFRP) composites, using an optical infrared thermography set-up in reflection mode. The response of the halogen lamps to the FPM waveform is measured, and further the influence of the electro-thermal latency of excitation lamps on the applicability of the novel FPM excitation signal is analytically investigated. Then, the performance of the FPM waveform is experimentally investigated for both glass- and carbon fiber reinforced polymers with defects of different depths and sizes. A comparative analysis is performed with amplitude modulated (classical lock-in), frequency modulated (sweep) and phase modulated (Barker coded) excitation, each with the same time duration as the FPM waveform. The novel FPM waveform outperforms these existing waveforms in terms of defect detectability and contrast-to-noise ratio, especially for the deeper defects. Different central frequencies are examined and the improved performance of the FPM waveform in TWR imaging is demonstrated in all cases.
机译：热波雷达（TWR）成像采用脉冲压缩的概念，以便在红外热成像测试中获得增加的探测深度和深度分辨率。 TWR成像的效率高度依赖于所采用的激励信号的性质。大多数研究利用使用模拟频率调制（例如扫描信号）或离散相位调制（例如Barker编码信号）的使用激励信号。最近，介绍了一种新的频相调制（FPM）波形，并由当前作者计算地验证，该作者彼此耦合彼此的频率和相位调制的概念，以便获得改进的TWR成像的优化激励信号。本本文通过反射模式采用光红外热成像设置，实验研究了用于检查玻璃和碳纤维增强聚合物（GFRP和CFRP）复合材料的新型优化FPM波形的性能。测量了卤素灯到FPM波形的响应，并进一步研究了激发灯对新型FPM激励信号的适用性的电热等待时间的影响。然后，针对具有不同深度和尺寸的缺陷的玻璃和碳纤维增强聚合物进行实验研究了FPM波形的性能。用幅度调制（经典锁定），频率调制（扫描）和相位调制（Barker编码）激励进行比较分析，每个脉冲具有与FPM波形相同的持续时间。新型FPM波形在缺陷可检测性和对比度偏差方面优于这些现有的波形，特别是对于更深的缺陷。检查不同的中央频率，并在所有情况下都证明了TWR成像中的FPM波形的改进性能。

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  • 来源
    《Optics and Lasers in Engineering》 |2021年第3期|106411.1-106411.12|共12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; Frequency-Phase Modulation (FPM); Electro-Thermal Latency; Pulse Compression; Composite; Thermal Wave Radar;

    机译：红外热成像;频率调制（FPM）;电热等待时间;脉冲压缩;复合;热波雷达;

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