Non-destructive Evaluation of a Corroded Metal Surface Using Terahertz Wave
Non-destructive Evaluation of a Corroded Metal Surface Using Terahertz Wave
复制标题
使用太赫兹波对腐蚀金属表面进行无损评估
DOI：
10.1149/05050.0081ecst
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Y. Oyama
中科院分区：
文献类型：
--
作者：
H. Kariya;A. Sato;T. Tanabe;K. Saito;K. Nishihara;A. Taniyama;Y. Oyama
在本文中，利用特征吸收光谱在太赫兹（THz）频率区域的无损评价的腐蚀金属表面涂有绝缘体的可能性进行了讨论。腐蚀产物的红外活性响应太赫兹波的特点。利用GaP晶体差频产生的频率可调谐太赫兹光源，测量了Zn-Al合金中典型腐蚀产物Al（OH）3和ZnCl 2·4 Zn（OH）2粉末的太赫兹吸收光谱。在两个光谱中都观察到特征吸收峰。随后，在部分覆盖有这些腐蚀产物和涂层的金属表面上进行THz反射成像。利用腐蚀产物的特征吸收峰，清晰地得到了腐蚀产物的空间分布。结果表明，THz波可以应用于绝缘体覆盖的腐蚀金属表面的无损评价。
In this paper, the possibility of utilizing characteristic absorption spectra in the terahertz (THz) frequency region for the nondestructive evaluation of a corroded metal surface coated with an insulator is discussed. The infrared activity of corrosion products in response to THz waves was characterized. The THz absorption spectra of Al (OH) 3 and ZnCl2· 4Zn (OH) 2 powders, which are typical corrosion products in Zn-Al alloy, were measured with a frequency tunable terahertz light source based on difference frequency generation from a GaP crystal. Characteristic absorption peaks were observed in both spectra. Subsequently, THz reflection imaging was conducted on a metal surface partially covered with these corrosion products and a coating. By using the characteristic absorption peaks of the corrosion products, the spatial distribution of these products was clearly obtained. From the results, it was shown that THz waves can be applied to the non-destructive evaluation of corroded metal surfaces coated with insulators.