抄録
Terahertz measurements were carried out to detect water trees grown in low-density polyethylene sheets. Water absorbs light at terahertz frequencies, fairly strongly at about 5.0 THz and rather weakly from 0.1 to 1.0 THz. Using the absorption at these frequencies, observation of water trees was tried according to the following procedures. First, we made a model sample, consisting of a polyethylene sheet, a water layer, and a copper plate, and terahertz light was irradiated to this sample vertically. The waveform and intensity of electric field of the terahertz light reflected by the sample clearly pointed out the presence of water layer beneath the polyethylene sheet by the reflection peak appearance time and the phase of reflected electric field. Secondly, water trees were grown in a polyethylene sheet, and terahertz light was scanned over the sheet. As a result, the intensity distribution of terahertz light reflected by the sample was in good agreement with the shape of the water trees. Observation of terahertz image was also carried out using the same polyethylene sheet with water trees over which a polyvinyl chloride sheet or a carbon-loaded polyethylene sheet was put to simulate the structure of a real cable. An image of water trees was also successfully observed. These results indicate that the terahertz spectroscopy can be a new characterization tool to observe the presence of water trees in a test sample taken from an aged cable.
| 元の言語 | English |
|---|---|
| 記事番号 | 6032826 |
| ページ（範囲） | 1570-1577 |
| ページ数 | 8 |
| ジャーナル | IEEE Transactions on Dielectrics and Electrical Insulation |
| 巻 | 18 |
| 発行部数 | 5 |
| DOI | |
| 出版物ステータス | Published - 2011 10 |
Fingerprint
ASJC Scopus subject areas
- Electrical and Electronic Engineering
これを引用
Observation of water trees using terahertz spectroscopy and time-domain imaging. / Sato, Ryo; Komatsu, Marina; Ohki, Yoshimichi; Fuse, Norikazu; Nakamichi, Yoshinobu; Mizuno, Maya; Fukunaga, Kaori.
：: IEEE Transactions on Dielectrics and Electrical Insulation, 巻 18, 番号 5, 6032826, 10.2011, p. 1570-1577.研究成果: Article
}
TY - JOUR
T1 - Observation of water trees using terahertz spectroscopy and time-domain imaging
AU - Sato, Ryo
AU - Komatsu, Marina
AU - Ohki, Yoshimichi
AU - Fuse, Norikazu
AU - Nakamichi, Yoshinobu
AU - Mizuno, Maya
AU - Fukunaga, Kaori
PY - 2011/10
Y1 - 2011/10
N2 - Terahertz measurements were carried out to detect water trees grown in low-density polyethylene sheets. Water absorbs light at terahertz frequencies, fairly strongly at about 5.0 THz and rather weakly from 0.1 to 1.0 THz. Using the absorption at these frequencies, observation of water trees was tried according to the following procedures. First, we made a model sample, consisting of a polyethylene sheet, a water layer, and a copper plate, and terahertz light was irradiated to this sample vertically. The waveform and intensity of electric field of the terahertz light reflected by the sample clearly pointed out the presence of water layer beneath the polyethylene sheet by the reflection peak appearance time and the phase of reflected electric field. Secondly, water trees were grown in a polyethylene sheet, and terahertz light was scanned over the sheet. As a result, the intensity distribution of terahertz light reflected by the sample was in good agreement with the shape of the water trees. Observation of terahertz image was also carried out using the same polyethylene sheet with water trees over which a polyvinyl chloride sheet or a carbon-loaded polyethylene sheet was put to simulate the structure of a real cable. An image of water trees was also successfully observed. These results indicate that the terahertz spectroscopy can be a new characterization tool to observe the presence of water trees in a test sample taken from an aged cable.
AB - Terahertz measurements were carried out to detect water trees grown in low-density polyethylene sheets. Water absorbs light at terahertz frequencies, fairly strongly at about 5.0 THz and rather weakly from 0.1 to 1.0 THz. Using the absorption at these frequencies, observation of water trees was tried according to the following procedures. First, we made a model sample, consisting of a polyethylene sheet, a water layer, and a copper plate, and terahertz light was irradiated to this sample vertically. The waveform and intensity of electric field of the terahertz light reflected by the sample clearly pointed out the presence of water layer beneath the polyethylene sheet by the reflection peak appearance time and the phase of reflected electric field. Secondly, water trees were grown in a polyethylene sheet, and terahertz light was scanned over the sheet. As a result, the intensity distribution of terahertz light reflected by the sample was in good agreement with the shape of the water trees. Observation of terahertz image was also carried out using the same polyethylene sheet with water trees over which a polyvinyl chloride sheet or a carbon-loaded polyethylene sheet was put to simulate the structure of a real cable. An image of water trees was also successfully observed. These results indicate that the terahertz spectroscopy can be a new characterization tool to observe the presence of water trees in a test sample taken from an aged cable.
KW - insulationdiagnosis
KW - non-destructive analysis
KW - terahertz imaging
KW - Water tree
UR - http://www.scopus.com/inward/record.url?scp=80054058894&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80054058894&partnerID=8YFLogxK
U2 - 10.1109/TDEI.2011.6032826
DO - 10.1109/TDEI.2011.6032826
M3 - Article
AN - SCOPUS:80054058894
VL - 18
SP - 1570
EP - 1577
JO - IEEE Transactions on Dielectrics and Electrical Insulation
JF - IEEE Transactions on Dielectrics and Electrical Insulation
SN - 1070-9878
IS - 5
M1 - 6032826
ER -