Observation of damage in insulated copper cables by THz imaging

Seiya Takahashi, Tomoyuki Hamano, Kaori Nakajima, Tadao Tanabe, Yutaka Oyama

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


A novel non-destructive inspection method using terahertz waves for the detection of broken wires in copper cables shielded by insulating polymer opaque in the visible and near infrared light region is presented. Terahertz reflection imaging, using a 0.14 THz IMPATT oscillator and a Schottky barrier detector, was applied to insulated copper cables that had been artificially damaged. The internal insulated wires embedded in the opaque polyethylene can be clearly visualized using THz radiation. It was shown that a gap in a wire can be detected by a decrease in the intensity of the reflected signal where the size of the gap is greater than the wavelength of the oscillator.

Original languageEnglish
Pages (from-to)75-79
Number of pages5
JournalNDT and E International
Publication statusPublished - 2014
Externally publishedYes


  • Copper conducting wire
  • Non-destructive inspection
  • THz imaging

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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