氷が破壊するときの発光現象  [in Japanese] Light emission associated with deformation and fracture of ice  [in Japanese]

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Author(s)

Abstract

氷の圧縮実験と光電子増倍管を用いた光(フォトン)の同時計測を行なった.それぞれの時間分解信号から,氷が破壊する時,または,クラックを形成する時に可視光領域(300~650nm)の光を出すことを検証した.さらに,測定波長域が近紫外域(200~320nm)と近赤外域(300~850 nm)を含む光電子増倍管を用い,それぞれ可視域と近紫外域,可視域と近赤外域の同時測定を行った.同時測定の相関から,発光強度が強い光には短波長成分が,発光強度の弱い光には長波長成分が多いことを明らかにした.<BR>可視域(300~650nm)の全スペクトルを含む発光強度は破壊時の歪エネルギーの増大とともに増す傾向を示した.しかし,同一の歪エネルギーにおける強度のばらつきは大きく,このことは発光強度が個々のクラックの特性にも大きく依存することを示唆する.<BR>氷の破壊時に可視域の光を放出するという事実はクラック表面,または先端で約1.9eV~4.1eVのエネルギーの電荷が形成されると考えられる.

We demonstrated photon emission during deformation and fracture of axially loaded polycrystalline ice. Emission of visible photons(300-650nm)was confirmed in accordance with crack generation and fracture. Time-resolved photon emission signals are presented along with load changes. After the intense emission occurring at a fracture event, there were several weak emissions which lasted for a few seconds. Emission intensity, including entire spectra ranging from 300 to 650nm, roughly increased with increasing strain energy released by fracture, while scattering in the intensity data showed that emission intensity also strongly depended on the characteristics of each individual crack. Intense emission contained shorter wavelengths than 320nm, indicating that near ultraviolet light is possibly emitted. Emission intensity and spectra may be attributed to microprocesses during fracture. Experimental evidence indicates that the generated electric charge on crack surfaces and at crack tips should have higher energy than that of the electrical potential difference reported previously (Fifolt et al.1993).

Journal

  • Journal of the Japanese Society of Snow and Ice

    Journal of the Japanese Society of Snow and Ice 64(3), 241-248, 2002-05-15

    The Japanese Society of Snow and Ice

References:  24

Codes

  • NII Article ID (NAID)
    10008434382
  • NII NACSIS-CAT ID (NCID)
    AN00131221
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    03731006
  • NDL Article ID
    6169974
  • NDL Source Classification
    ZM43(科学技術--地球科学--気象)
  • NDL Call No.
    Z15-23
  • Data Source
    CJP  NDL  J-STAGE 
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