Thermal wave radar (TWR) thermography is a high-efficient nondestructive testing technique to increase the signal-to-noise ratio (SNR) and to enhance target detection capability. However, the detection of subsurface defects, especially small-size defects, usually requires a distinctively high SNR and depth resolvability. This paper proposed an orthogonal phase-coded linear frequency modulated (OPCLFM) excitation waveform, which has significantly improved the SNR and depth resolvability of TWR compared to the LFM waveform. The pulse compression quality of the OPCLFM waveform was initially evaluated through a 1D thermal wave analytical model of carbon fiber reinforced polymer (CFRP) laminate. Results show that the OPCLFM waveform combined with the Kaiser window function compresses the largest sidelobe at least by 18.39 dB compared to the LFM waveform. Furthermore, the superior depth resolvability performance of the OPCLFM waveform was also validated by 3D finite element simulation. Finally, the effect of thermal conductivity on the depth resolvability performance of the OPCLFM waveform was evaluated quantitatively by a delaminated CFRP laminate.
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14 June 2022
Research Article|
June 09 2022
Advanced orthogonal frequency and phase modulated waveform for contrast-enhanced photothermal wave radar thermography
Special Collection:
Non-Invasive and Non-Destructive Methods and Applications Part I — Festschrift
Zhi-Tao Luo
;
Zhi-Tao Luo
Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University
, Nanjing 211189, China
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Peng Shen;
Peng Shen
Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University
, Nanjing 211189, China
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Hao Luo;
Hao Luo
a)
Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University
, Nanjing 211189, China
a)Authors to whom correspondence should be addressed: seuzhanghui@seu.edu.cn and luohao_seu@seu.edu.cn
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Sheng Wang
;
Sheng Wang
Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University
, Nanjing 211189, China
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Xin-Kai Wu;
Xin-Kai Wu
Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University
, Nanjing 211189, China
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Hui Zhang
Hui Zhang
a)
Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University
, Nanjing 211189, China
a)Authors to whom correspondence should be addressed: seuzhanghui@seu.edu.cn and luohao_seu@seu.edu.cn
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a)Authors to whom correspondence should be addressed: seuzhanghui@seu.edu.cn and luohao_seu@seu.edu.cn
Note: This paper is part of the Special Topic on Non-Invasive and Non-Destructive Methods and Applications Part I: Festschrift.
J. Appl. Phys. 131, 224903 (2022)
Article history
Received:
February 08 2022
Accepted:
May 21 2022
Citation
Zhi-Tao Luo, Peng Shen, Hao Luo, Sheng Wang, Xin-Kai Wu, Hui Zhang; Advanced orthogonal frequency and phase modulated waveform for contrast-enhanced photothermal wave radar thermography. J. Appl. Phys. 14 June 2022; 131 (22): 224903. https://doi.org/10.1063/5.0087734
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