Construction of a Gigahertz Measurement System and Application of Non-destructive Testing Inside Reinforced Concrete

A spectral measurement system using a sub-THz source in the bandwidth up to 100 GHz, obtained by multiplying and amplifying a frequency-variable signal in the GHz band operated by a silicon semiconductor device, was constructed in conjunction with a frequency-tunable single-frequency THz source usin...

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Bibliographic Details
Published inTetsu to hagane Vol. 110; no. 12; pp. TETSU-2024-039 - 917
Main Author Tanabe, Tadao
Format Journal Article
LanguageJapanese
English
Published The Iron and Steel Institute of Japan 2024
Subjects
concrete structure
corrosion
non-destructive
terahertz
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Summary:A spectral measurement system using a sub-THz source in the bandwidth up to 100 GHz, obtained by multiplying and amplifying a frequency-variable signal in the GHz band operated by a silicon semiconductor device, was constructed in conjunction with a frequency-tunable single-frequency THz source using GaP, which has been developed previously, in a transmission and reflection optical arrangement. The absorption spectra of ferrous corrosion products and the reflective imaging of metal fragments hidden behind concrete plate were measured. These results of the sub-THz and THz waves suggest that the interior of building structures can be inspected non-destructively based on the dielectric constant-based absorption and reflection of corrosion products and metals inside the concrete and metal surface under coating respectively, which have a high transmission property.
ISSN:0021-1575
1883-2954
DOI:10.2355/tetsutohagane.TETSU-2024-039