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Study of Laser-Generated Longitudinal Waves Interacting with an Internal Spherical Cavity by Use of a Transmission Time Delay Method

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Abstract

In order to improve the detection sensitivity and stability of scanning laser ultrasound techniques, we propose a transmission time delay method, based on the time delay of transmitted longitudinal waves, for the evaluation of the size and position of an internal cavity. By studying the interacting process between the longitudinal wave and the internal cavity through theory and finite element method, the relationships among the time delay, cavity radius, and the detection distance were determined. The monotonicity of the relationship indicates that the time delay can be used to inverse the radius and the depth position of the internal cavity. The laser ultrasound experiments were performed on three aluminum samples with different internal cavities through the concentric transmission method. The C-scan results show that compared with using amplitude attenuation to detect the cavity, the time delay of transmitted waves can detect the internal cavities more stably and accurately. The experimental data are close to the theoretical and simulation results, and the inversion of cavity depth was achieved based on the measured parameters (the time delay, cavity radius, frequency, velocity). The results demonstrate that the transmission time delay method has a great application potential in the localization and quantification of the internal defects.

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Acknowledgment

This work was supported by the National Natural Science Foundation of China (Nos. 61801451, 51905506).

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Authors and Affiliations

  1. Institute of Mechanical Manufacturing Process, China Academy of Engineering Physics, Mianyang, China

    Kaihua Sun, Chaoming Sun, Jianwen Li, Zengyong Wang, Wei Gao & Qichao Fan

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  1. Kaihua Sun
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  2. Chaoming Sun
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  3. Jianwen Li
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  4. Zengyong Wang
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  5. Wei Gao
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  6. Qichao Fan
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Correspondence to Kaihua Sun.

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Sun, K., Sun, C., Li, J. et al. Study of Laser-Generated Longitudinal Waves Interacting with an Internal Spherical Cavity by Use of a Transmission Time Delay Method. Int J Thermophys 41, 81 (2020). https://doi.org/10.1007/s10765-020-02666-z

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  • DOI: https://doi.org/10.1007/s10765-020-02666-z

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