| Project/Area Number |
11792004
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| Research Category |
Grant-in-Aid for University and Society Collaboration
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| Allocation Type | Single-year Grants |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Yamagata University |
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Principal Investigator |
TANNO Naohiro Yamagata University, Graduate school of science and engineering, Professor, 大学院・理工学研究科, 教授 (00006248)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Manabu Yamagata University, Graduate school of science and engineering, Associate Professor, 大学院・理工学研究科, 助教授 (50226007)
船場 忠幸 山形大学, 大学院・理工学研究科, 助手 (30238654)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 2001: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Keywords | optical coherence tomography / high spatial resolution / synthesized light source / stability of heterodyne beat signal / Compact interferometer / simultaneous measurements of velocity vector and image / 生体断層画像 / 光学干渉系 / インコヒーレント光源 / コヒーレンス / 空間分解能 / スペクトル幅 / コヒーレンス光源 / コヒーレント / 共焦点光学系 / コヒーレント光源 |
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| Research Abstract |
The objects of this study are a)The research and developments for the enhancement of a spatial resolution of OCT b) The research and developments of new imaging techniques for wide clinical applications.
1) Synthesized light source for high spatial resolution of OCT
We proposed the optimization method of the synthesized light source that consists of multi-light sources and showed the decrease of coherence length suppressing the side-lobes.
2) Enhancement of stabilization of heterodyne beat signal
We enhanced the stabilization of heterodyne beat signal using its harmonics. The actual conditions of modulation index were shown by the experiments and simulations for expansions of light sources (laser, superluminescent diode, halogenlamp), phase modulation signals (sinusoidal wave and triangle wave) and harmonics to 8^<th>.
3) The coaxial Mirau interferometer as the compact OCT for wide application
The coaxial Mirau interferometer has been proposed as the compact interferometer. That interferometer consists of can type SLD, collimator lens, half mirror with PZT and objective lens. The axial and lateral spatial resolutions are 21μm, 10μm, respectively. The surface of Japanese coin were measured as the sample of rough surfaces.
4) The imaging method of simultaneous measurements of velocity vector and sectional image
The simultaneous measurements of velocity vector and sectional image have been studied using the Doppler effect by three-beam and the confocal optics. The measured values from -2mm/s to 2mm/s corresponded to calculated ones. The axial and lateral profiles were measured at about 10μm.
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