金属材料亚表面的光热辐射检测
发布时间：2019-06-09 17:01
【摘要】：为探讨光热辐射(PTR)技术检测金属材料亚表面缺陷的能力,理论分析了双层材料在强度调制激光束激励下产生的热波幅值和相位,实验检测了阶梯型钢板样品、铝/钢质盲孔阵列样品和钢质填锡盲孔样品的光热辐射信号。对于直径分别为2.5,2.0,1.5mm,孔底厚度分别为0.2,0.4,0.6mm的铝质盲孔阵列样品,实验得到的光热辐射相位分布显示了盲孔直径和孔底厚度的可区分性。对于钢质盲孔阵列样品,在盲孔填锡前后的光热辐射相位分布显示出一定区别。实验结果表明:聚焦光斑的光热辐射检测能探测到深度小于或约等于面层材料热扩散长度,截面积约等于或大于光斑面积的铝或钢内气孔缺陷。
[Abstract]:In order to explore the ability of photothermal radiation (PTR) technique to detect subsurface defects of metal materials, the amplitude and phase of thermal wave produced by double layer materials excited by intensity modulation laser beam are analyzed theoretically, and the stepped steel plate samples are tested. Photothermal radiation signals of aluminum / steel blind hole array samples and steel tin filled blind hole samples. For aluminum blind hole array samples with diameters of 2.5 mm, 2.0 mm, 1.5 mm and 0.2 mm, 0.4 mm and 0.6 mm, respectively, the photothermal radiation phase distribution shows the differentiability of blind hole diameter and hole bottom thickness. For steel blind hole array samples, the photothermal radiation phase distribution before and after filling tin in blind hole shows a certain difference. The experimental results show that the photothermal radiation detection of the focused spot can detect the pore defects in aluminum or steel whose depth is less than or equal to the thermal diffusion length of the surface material and the cross section area is about or larger than the spot area.
【作者单位】： 同济大学物理科学与工程学院;江苏省计量科学研究院;
【基金】：国家自然科学基金(11374230)
【分类号】：TG115
本文编号：2495726
[Abstract]:In order to explore the ability of photothermal radiation (PTR) technique to detect subsurface defects of metal materials, the amplitude and phase of thermal wave produced by double layer materials excited by intensity modulation laser beam are analyzed theoretically, and the stepped steel plate samples are tested. Photothermal radiation signals of aluminum / steel blind hole array samples and steel tin filled blind hole samples. For aluminum blind hole array samples with diameters of 2.5 mm, 2.0 mm, 1.5 mm and 0.2 mm, 0.4 mm and 0.6 mm, respectively, the photothermal radiation phase distribution shows the differentiability of blind hole diameter and hole bottom thickness. For steel blind hole array samples, the photothermal radiation phase distribution before and after filling tin in blind hole shows a certain difference. The experimental results show that the photothermal radiation detection of the focused spot can detect the pore defects in aluminum or steel whose depth is less than or equal to the thermal diffusion length of the surface material and the cross section area is about or larger than the spot area.
【作者单位】： 同济大学物理科学与工程学院;江苏省计量科学研究院;
【基金】：国家自然科学基金(11374230)
【分类号】：TG115
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