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
  • [11] Fukuchi T., Fuse N., Mizuno M., Fukunaga K., Measurement of refractive index of thermal marrier coating using reflection of terahertz waves and variable aparture, IEEJ Trans. FM, 134, 8, pp. 478-484, (2014)
  • [12] Fukuchi T., Fuse N., Mizuno M., Fukunaga K., Surface roughness measurement of thermal barrier coating using terahertz waves, The Papers of Technical Meeting on Instrumentation and Measurement, (2015)
  • [13] Anastasi R., Madaras E., Terahertz NDE for metallic surface roughness evaluation, Int'l Workshop on Ultasonic and Advanced Methods for Nondestructive Testing and Material Characterization Proceedings, pp. 57-62, (2006)
  • [14] Dikmelik Y., Spicer J.B., Fitch N.J., Osiander R., Effects of surface roughness on reflection spectra obtained by terahertz time-domain spectroscopy, Opt. Lett., 31, 24, pp. 3653-3655, (2006)
  • [15] Ortolani M., Lee J.S., Schade U., Hubers H.-W., Surface roughness effects on the terahertz reflectance of pure explosive materials, Appl., Phys. Lett., 93, pp. 0819061-0819063, (2008)
  • [16] Zurk L.N., Sundberg G., Schecklman S., Zhou Z., Chen A., Thrsos E.I., Scattering effects in terahertz reflection spectroscopy, Terahertz for Military and Security Applications VI, 6949, pp. 6949071-6949078, (2008)
  • [17] Jagannathan A., Gatesman A.J., Giles R.H., Characterization of roughness parameters of metallic sucfaces using terahertz reflection spectra, Opt. Lett., 34, 13, pp. 1927-1929, (2009)
  • [18] Hermann M., Wiegand C., Jonuscheit J., Beigang R., The influence of surface roughness on THz reflection measurements, Int'l Conf. Infrared, Millimeter, and Terahertz Waves, (2009)
  • [19] THz Database
  • [20] Fuse N., Takahashi T., Ohki Y., Sato R., Mizuno M., Fukunaga K., Terahertz spectroscopy as a new tool for insulating material analysis and condition monitoring, IEEE Electr. Insul. Mag., 27, 3, pp. 30-39, (2011)
12