Characterization of laser-induced vibration on concrete surface toward highly efficient laser remote sensing
Characterization of laser-induced vibration on concrete surface toward highly efficient laser remote sensing
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DOI：
10.35848/1347-4065/ab9849
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发表时间：
2020-07-01
影响因子：
1.5
通讯作者：
Nishikino, Masaharu
中科院分区：
文献类型：
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作者：
Mikami, Katsuhiro;Hasegawa, Noboru;Nishikino, Masaharu
激光遥感（LRS）使用高功率激光脉冲的照射提供了特征振动（CV），这是伴随着内部退化。激光散射检测的原理与传统的锤击检测相同，但优化激光脉冲对振动样品的照射参数是有效进行激光散射检测的关键。在这项研究中，表现出模拟内部缺陷的混凝土试件上的CV的频率和幅度进行了评估，通过激光脉冲照射和摆锤冲击。当激光脉冲照射时，CV的大小随着激光脉冲能量的增加而线性增加，并且观察到高阶振动。另一方面，最佳的光斑尺寸是由能量密度和CV的大小之间的非线性相关性指示的。为了获得一个有效的LRS，我们建议，高的激光能量密度和优化的激光光斑尺寸是必不可少的。
Laser remote sensing (LRS) using irradiation of high-power laser pulses provides characteristic vibrations (CVs) which are accompanied by internal deterioration. While the principle of LRS is the same as that of the traditional hammering inspection, optimizing the irradiation parameters of laser pulses for vibrating samples is essential for effective LRS. In this study, the frequencies and magnitudes of CVs on a concrete specimen exhibiting a mock inside defect were evaluated by laser pulse irradiation and pendulum impact. When laser pulses were irradiated, the magnitude of CVs increased linearly with increasing laser pulse energy, and higher-order vibration was observed. On the other hand, an optimal spot size was indicated by the non-linear correlation between the fluence and the magnitude of CVs. To obtain an effective LRS, we propose that both high laser fluence and an optimized laser spot size are essential.