Pulse acoustic technology for measurement of charge distribution in dielectric materials for spacecraft

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Recently, some accidents in spacecraft due to the charging up by irradiation of charged particle have been reported. Some of them are caused by surface discharge normally happens in plasma environment of space. Some others seem to be caused by discharge due to an accumulation of charge in bulk of materials in relatively higher altitude environment. To investigate the charge accumulation in bulk of materials, we have been developing the internal charge measurement system. The internal charge accumulation in dielectric materials under irradiation of artificial radioactive ray is observed using the developed systems, which are so called PEA and PWP methods based on acoustic measurement techniques. The developed system is applicable to measure the charge distribution in dielectrics in air atmosphere or vacuum environment under electron beam, proton beam and gamma ray irradiations. Using the systems, we carried out the measurements of bulk charge distributions in polymeric films and glass materials. In this report, summary of some typical measurement results are introduced following the brief explanation of measurement principles.

資料番号: AA0049206002

レポート番号: JAXA-SP-05-001E

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