抄録
A compact sub-terahertz (THz) imaging system with a 0.2 THz-band GaAs TUNNETT diode oscillator and its application for non-destructive and harmless inspections of timbers, concrete and ceramic tiles are shown. Sub-THz transmission characteristics of various kinds of woods were investigated. It is shown that wood and concrete show a high transmittance in this frequency range, and that the measured absorption coefficients correlate well with the densities of woods. Then, the invisible grains, knots and diffused water inside the timbers were investigated by sub-THz transmission imaging. It is also shown that the sub-THz wave is a very efficient tool for defect recognition in concrete. Invisible cracks, diffused water and the quality of adhesion of tiles were investigated. It is concluded that the sub-THz wave has shown a high sensitivity in detecting these defects in building blocks.
| 本文言語 | English |
|---|---|
| ページ（範囲） | 28-33 |
| ページ数 | 6 |
| ジャーナル | NDT and E International |
| 巻 | 42 |
| 号 | 1 |
| DOI | |
| 出版ステータス | Published - 2009 1月 |
| 外部発表 | はい |
ASJC Scopus subject areas
- 材料科学（全般）
- 凝縮系物理学
- 機械工学