1992 Fiscal Year Final Research Report Summary
Development of Precise Stress-strain Measurement System by Employing Electronic Speckle Pattern Interferometry
| Project/Area Number |
03554010
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体地球物理学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
TAKEMOTO Shuzo Kyoto University, Dept.Geophysics, Associate Processor, 理学部, 助教授 (40027256)
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| Co-Investigator(Kenkyū-buntansha) |
TENJINBAYASHI Koji Mechanical Engineering Laboratory, Applied Physics and Information. CHief Resear, 機械技術研究所, 主任研究官
TANAKA Yutaka Kyoto University, Dept.Geophysics, Lecturer, 理学部, 講師 (40025333)
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| Project Period (FY) |
1991 – 1992
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| Keywords | LASER / CRUSTAL DEFORMATION / CRUSTAL STRESS / HOLOGRAPHY / IMAGE PROCESSING / VISUALIZATION / ESPI / 干渉法 |
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| Research Abstract |
The aim of research is to develop a new type of crustal-strain and -stress measurement system by employing the technique of Electronic Speckle Pattern Interferometry (ESPI), which enables, as well as holographic interferometry, two or three dimensional deformation of object to be measured quantitatively in terms of the wavelength of laser light without any contacting the object. Moreover, the ESPI technique has some attractive feature compared with holographic interferometry, i.e, short exposure time and no need for wet photographic processing, because this technique does not use a holographic plate instead a video camera to record interference fringe patterns.
In 1991, we developed a borehole module of the ESPI stress measurement system. The module is designed to be very compact (10cm in diameter and about 50cm in length) and to be used in a small borehole.
In January, 1992, The first field experiment using the ESPI borehole stressmeter was carried out in a tunnel at the Hiraki mine, Hyogo Prefecture.
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