Estimation of surface scattering effect on terahertz non-contact detection of underfilm corrosion

被引：0
作者：
Fuse N. [1 ]
Fukuchi T. [1 ]
机构：
[1] Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka
来源：
IEEJ Transactions on Fundamentals and Materials | 2017年 / 137卷 / 03期
关键词：
Deconvolution; Scattering; Surface roughness; Terahertz waves; Time domain spectroscopy; Underfilm corrosion;
D O I：
10.1541/ieejfms.137.158
中图分类号：
学科分类号：
摘要：
Two dimensional reflection intensity distributions of terahertz wave intensity provide a direct transparent image of corrosion beneath opaque anticorrosion paint layers. However, attention needs to be paid to changes in effective reflectivity due to uneven surfaces. This study demonstrates in-situ estimation of surface roughness and reflective index by frequency analysis of the terahertz wave form reflection echoes. Deconvolution technique is applied to resolve the undulation of the waveform to separate the overlapping of the reflections from the front and back surfaces of the paint. Estimated and measured roughness values are in good agreement, to show roughness and refractive index distribution of a service-used transmission tower cross-arm. © 2017 The Institute of Electrical Engineers of Japan.
引用
收藏
页码：158 / 164
页数：6
相关论文
共 20 条
  • [1] Fuse N., Fukuchi T., Takahashi T., Mizuno M., Fukunaga K., Evaluation of applicability of noncontact analysis methods to detect rust regions in coated steel plates, IEEE Trans. Terahertz Sci. & Technol., 2, 2, pp. 242-249, (2012)
  • [2] Fuse N., Fukuchi T., Takahashi T., Mizuno M., Fukunaga K., Okamoto T., Correlation between terahertz waves and electrochemical impedance measurements in detecting rust regions in coated steel plates, IEEJ Trans. FM, 132, 9, pp. 709-715, (2012)
  • [3] Fuse N., Fukuchi T., Mizuno M., Fukunaga K., High-speed underfilm corrosion imaging using a terahertz camera, IEEJ Trans. FM, 135, 4, pp. 241-246, (2015)
  • [4] Fuse N., Naganuma A., Mizuno M., Fukunaga K., Fukuchi T., Hori Y., Underfilm corrosion of transmission tower cross-arms service-used in a pacific coast area, Corrosion, 71, 11, pp. 1387-1397, (2015)
  • [5] Kharkovsky S., Zoughi R., Microwave and millimeter wave nondestructive testing and evaluation, IEEE Instru. Meas. Mag., 10, 2, pp. 26-38, (2007)
  • [6] Anastasi R.F., Madaras E.I., Terahertz NDE for under paint corrosion detection and evaluation, Rev. Quant. Nondestructive Eval, 25, pp. 515-522, (2006)
  • [7] Kurabayashi T., Sakai S., Fujino K., Sub-terahertz imaging of a painted steel, Int. Conf. Infrared Millimeter and THz Waves, pp. 1-2, (2010)
  • [8] Nakamura Y., Kariya H., Sato A., Tanabe T., Nishihara K., Taniyama A., Nakajima K., Maeda K., Oyama Y., Non-destructive corrosion diagnosis of painted hot-dip galvanizing steel sheets by using THz spectral imaging, Zairyo-to-Kankyo, 63, 9, pp. 504-509, (2014)
  • [9] Debye P., Interferenz von Röntgenstrahlen und Wärmebewegung, Annalen der Physik, 348, pp. 49-92, (1913)
  • [10] Fukuchi T., Fuse N., Okada M., Ozeki T., Fujii T., Mizuno M., Fukunaga K., Topcoat thickness measurement of thermal barrier coating of gas turbine blade using terahertz wave, IEEJ Trans. FM, 133, 7, pp. 395-401, (2013)
12