Detection of overheated parts in low-density polyethylene by terahertz absorption spectroscopy and imaging

Tomoyuki Izutsu, Daisuke Odaka, Takuya Kozai, Marina Komatsu, Yoshimichi Ohki, Takashi Saitou, Takanori Yamazaki

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Overheating during the manufacturing process of a cross-linked polyethylene-insulated cable often induces brownish resin, which may become a starting point of breakdown and water trees. In this study, an XLPE sheet was overheated and cut to many pieces of squares with various sizes from 0.5×0.5 to 10×10 mm2. Then, each piece was sandwiched between two sheets of low-density polyethylene and its absorption intensity was measured at terahertz (THz) frequencies. Furthermore, the spatial distribution of absorption was measured in the form of a two-dimensional image by scanning the sample. As a result, it has become clear that the whole absorption increases in a range from 0.5 to 5.0 THz when the volume of overheated part becomes bigger. Moreover, the distribution of overheated parts can be visualized by the THz absorption imaging.

    Original languageEnglish
    Pages (from-to)603-608
    Number of pages6
    JournalIEEJ Transactions on Fundamentals and Materials
    Volume136
    Issue number9
    DOIs
    Publication statusPublished - 2016

    Keywords

    • Cross-linked polyethylene
    • Imaging
    • Low-density polyethylene
    • Overheating
    • Terahertz time domain spectroscopy
    • Terahertz wave

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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