著者

岡田 東一 鈴木 健太郎 柴田 俊一 萩原 武士 兼田 利勝

出版者

福井工業大学

雑誌

福井工業大学研究紀要. 第一部 (ISSN:02868571)

巻号頁・発行日

vol.33, pp.159-166, 2003-03-20

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The time capsule [Biological and Environmental Specimens Time Capsule] aims at the storage of biological and environmental data on contemporary earth until 1000 year future from now on. In order to make the samples kept in the capsule for ultra-long time useful in judging that of biological and environmental degradation of the earth comparing the data with 1000 year time difference, two conditions for the biological contents in the capsule are necessary they are: (1) oxygen free and (2) temperature below -60℃, which should strictly be fulfilled for 1,000 years. The ultra-long-term recorder has been developed which is energized by the stored energy of the materials. The time span [t] is regulated by the torsion creep behavior of pure copper. The pressure [P] in the capsule is to be monitored by a pen cylinder type pressure gauge, and temperature [T] by bimetal. All these three essential key values: P, T, in the capsule and time are to be recorded on the clean surface of metal plate with the scratch of the needles, which follows on each sensor. The extrapolation of the torsion creep data gives approximately 8 rotations on time scale shaft, which leads us to the 40mm transverse motion of scratch needles during 1000 year [3×10^<10>sec] lapse of time.