Abstract
Through examinations of the applicability of novel terahertz spectroscopy to the diagnosis of integrity of polymeric insulated cables, the following important examples have been obtained. First, the attenuation of the reflected intensity of THz light was scanned over a low density polyethylene sheet with water trees under a polyvinylchloride sheet. As a result, its intensity distribution agrees with the distribution of water trees in the sample. Therefore, water trees would be visualizable even if they are invisible to naked eyes. Secondly, chemically cross-linked polyethylene sheets were irradiated by gamma-rays to certain designated doses. A peak appears at around 44 cm -1 (= 1.3 THz) when the dose is higher than 200 kGy. Combining the results obtained by instrumental analyses, the 44-cm -1 peak is likely to be due to oxidation-related dipoles. Thirdly, the reflected THz light intensities were compared among an uncorroded copper plate and three corroded plates with copper oxide, basic copper carbonate, and copper chloride. The last two corroded plates were found to exhibit absorption strong enough for the THz light to give clear images of corrosion.
| Original language | English |
|---|---|
| Title of host publication | Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP |
| Pages | 203-206 |
| Number of pages | 4 |
| DOIs | |
| Publication status | Published - 2012 |
| Event | 2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012 - Montreal, QC, Canada Duration: 2012 Oct 14 → 2012 Oct 17 |
Other
| Other | 2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012 |
|---|---|
| Country | Canada |
| City | Montreal, QC |
| Period | 12/10/14 → 12/10/17 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering
Cite this
Terahertz spectroscopy as a novel method for diagnosing the integrity of polymer insulated cables. / Ohki, Yoshimichi; Komatsu, Marina; Mizuno, Maya; Fukunaga, Kaori.
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. 2012. p. 203-206 6378756.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Terahertz spectroscopy as a novel method for diagnosing the integrity of polymer insulated cables
AU - Ohki, Yoshimichi
AU - Komatsu, Marina
AU - Mizuno, Maya
AU - Fukunaga, Kaori
PY - 2012
Y1 - 2012
N2 - Through examinations of the applicability of novel terahertz spectroscopy to the diagnosis of integrity of polymeric insulated cables, the following important examples have been obtained. First, the attenuation of the reflected intensity of THz light was scanned over a low density polyethylene sheet with water trees under a polyvinylchloride sheet. As a result, its intensity distribution agrees with the distribution of water trees in the sample. Therefore, water trees would be visualizable even if they are invisible to naked eyes. Secondly, chemically cross-linked polyethylene sheets were irradiated by gamma-rays to certain designated doses. A peak appears at around 44 cm -1 (= 1.3 THz) when the dose is higher than 200 kGy. Combining the results obtained by instrumental analyses, the 44-cm -1 peak is likely to be due to oxidation-related dipoles. Thirdly, the reflected THz light intensities were compared among an uncorroded copper plate and three corroded plates with copper oxide, basic copper carbonate, and copper chloride. The last two corroded plates were found to exhibit absorption strong enough for the THz light to give clear images of corrosion.
AB - Through examinations of the applicability of novel terahertz spectroscopy to the diagnosis of integrity of polymeric insulated cables, the following important examples have been obtained. First, the attenuation of the reflected intensity of THz light was scanned over a low density polyethylene sheet with water trees under a polyvinylchloride sheet. As a result, its intensity distribution agrees with the distribution of water trees in the sample. Therefore, water trees would be visualizable even if they are invisible to naked eyes. Secondly, chemically cross-linked polyethylene sheets were irradiated by gamma-rays to certain designated doses. A peak appears at around 44 cm -1 (= 1.3 THz) when the dose is higher than 200 kGy. Combining the results obtained by instrumental analyses, the 44-cm -1 peak is likely to be due to oxidation-related dipoles. Thirdly, the reflected THz light intensities were compared among an uncorroded copper plate and three corroded plates with copper oxide, basic copper carbonate, and copper chloride. The last two corroded plates were found to exhibit absorption strong enough for the THz light to give clear images of corrosion.
UR - http://www.scopus.com/inward/record.url?scp=84872054894&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84872054894&partnerID=8YFLogxK
U2 - 10.1109/CEIDP.2012.6378756
DO - 10.1109/CEIDP.2012.6378756
M3 - Conference contribution
AN - SCOPUS:84872054894
SP - 203
EP - 206
BT - Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
ER -