【摘要】：為探討光熱輻射(PTR)技術(shù)檢測(cè)金屬材料亞表面缺陷的能力,理論分析了雙層材料在強(qiáng)度調(diào)制激光束激勵(lì)下產(chǎn)生的熱波幅值和相位,實(shí)驗(yàn)檢測(cè)了階梯型鋼板樣品、鋁/鋼質(zhì)盲孔陣列樣品和鋼質(zhì)填錫盲孔樣品的光熱輻射信號(hào)。對(duì)于直徑分別為2.5,2.0,1.5mm,孔底厚度分別為0.2,0.4,0.6mm的鋁質(zhì)盲孔陣列樣品,實(shí)驗(yàn)得到的光熱輻射相位分布顯示了盲孔直徑和孔底厚度的可區(qū)分性。對(duì)于鋼質(zhì)盲孔陣列樣品,在盲孔填錫前后的光熱輻射相位分布顯示出一定區(qū)別。實(shí)驗(yàn)結(jié)果表明:聚焦光斑的光熱輻射檢測(cè)能探測(cè)到深度小于或約等于面層材料熱擴(kuò)散長(zhǎng)度,截面積約等于或大于光斑面積的鋁或鋼內(nèi)氣孔缺陷。
[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.
【作者單位】： 同濟(jì)大學(xué)物理科學(xué)與工程學(xué)院;江蘇省計(jì)量科學(xué)研究院;
【基金】：國(guó)家自然科學(xué)基金(11374230)
【分類號(hào)】：TG115

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