Theoretical and Experimental Investigations of Transmission Coefficients of Longitudinal Waves through Metal Plates Immersed in Air for Uses of Air Coupled Ultrasounds
Theoretical and Experimental Investigations of Transmission Coefficients of Longitudinal Waves through Metal Plates Immersed in Air for Uses of Air Coupled Ultrasounds
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DOI：
10.2320/matertrans.mra2008270
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发表时间：
2008-12
影响因子：
1.2
通讯作者：
H. Nishino;S. Masuda;Kenichi Yoshida;Masakazu Takahashi;H. Hoshino;Y. Ogura;H. Kitagawa;J. Kusumoto;A. Kanaya
中科院分区：
文献类型：
--
作者：
H. Nishino;S. Masuda;Kenichi Yoshida;Masakazu Takahashi;H. Hoshino;Y. Ogura;H. Kitagawa;J. Kusumoto;A. Kanaya
对空气中金属板的纵波透射系数进行了理论和实验研究，用于金属板的非接触无损检测。为了比较，还显示了在水中通过金属板和在空气中通过聚合物板的透射系数。描述了透射系数与兰姆波色散之间的理论关系。实验结果表明，兰姆波产生时，透射系数都很高。定量评价的透射系数进行了研究，使用的空气耦合超声波。使用1-，3-和5-mm厚的铝板进行实验验证。透射系数的实验结果与理论预测相当吻合。
Theoretical and experimental investigations of transmission coefficients of longitudinal waves through metal plates immersed in air have been carried out for noncontact and nondestructive testing (NDT) of metal plates. Transmission coefficients through metal plates in water and through polymer plates in air have also been shown for comparisons. Theoretical relations between the transmission coefficients and the Lamb wave dispersions were described. It was confirmed that the transmission coefficients took high values when the Lamb waves were generated without exception. Quantitative evaluations for the transmission coefficients were investigated for the use of the air-coupled ultrasounds. The experimental verifications were carried out using 1-, 3-, and 5-mm-thick aluminum plates. The experimental results of the transmission coefficients were in fairly good agreement with the theoretical predictions.