Three-dimensional refractive index measurement system using shear interferometer
| Project/Area Number |
18K04158
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 21030:Measurement engineering-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
宮本 直樹 北海道大学, 工学研究院, 准教授 (00552879)
西山 修輔 日本医療大学, 保健医療学部, 教授 (30333628)
松本 裕 北海道大学, 工学研究院, 助教 (40360929)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 屈折率分布 / 三次元非接触計測 / シア干渉計 / コンピュータトモグラフィー / 位相計測 / 非定常 / 非定常現象 / 三元非接触計測 |
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| Outline of Final Research Achievements |
In order to measure the three-dimensional refractive index distribution, a coupling method of interferometer and computed tomography can be used. As the interferometer to measure delay of wavefront due to object from different incident angles, we adopted a shearing interferometer, which always satisfies interference condition during changing incident angle since the shearing interferometer does not use a reference wave. We demonstrated that interferograms obtained with the shearing interferometer are not affected by vibration caused by changing of the incident direction. In addition, we measured the three-dimensional distribution of the refractive index of the gas near the candle flame, and the reconstructed result was qualitative agreed.
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| Academic Significance and Societal Importance of the Research Achievements |
気体の密度(温度)や液体の濃度等は屈折率に依存するため、屈折率の三次元分布の計測ができれば、間接的にこれらの量の三次元分布を計測できる。従来の三次元屈折率分布を計測する手法としては、物体光と参照光を用いた二光束干渉計とコンピュータトモグラフィーの利用が数少ない例であった。その理由は二光束干渉計では、複数方向からの干渉計測が容易でなかったためと考えられるが、本研究で採用したシア干渉計は、方向を変更した場合でも、干渉条件を常に満たし、かつ、振動の影響を受けないため測定体系の構築が容易になる。今後、多くの測定対象の三次元計測に期待できる。
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Report
(4 results)
Research Products
(15 results)
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[Presentation] Real-time volumetric image generation with CT image deformation driven by displacement of internal fiducial markers2018
Author(s)
Naoki Miyamoto, Naoki Matsumoto, Ryusuke Suzuki, Seishin Takao, Taeko Matsuura, Takaaki Fujii, Shusuke Hirayama, Satoshi Tomioka, Shinichi Shimizu, Kikuo Umegaki, Hiroki Shirato
Organizer
2018 AAPM Annual Meeting
Related Report
Int'l Joint Research
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