3-D image sensing by phase shifting digital holography
| Project/Area Number |
10450030
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | RIKEN (The Institute of Physical and Chemical Research) |
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Principal Investigator |
YAMAGUCHI Ichirou RIKEN, Chief Scientist, Head of Opt. Eng. Lab., 光工学研究室, 主任研究員 (70087443)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Akihiro RIKEN, Junior Scientist of Opt. Eng. Lab., 光工学研究室, 研究員補 (30260201)
KATO Jun-ichi RIKEN, Senior Scientist of Opt. Eng. Lab., 光工学研究室, 先任研究員 (70177450)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 1999: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1998: ¥4,700,000 (Direct Cost: ¥4,700,000)
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| Keywords | Holography / Interferometry / Image processing / Microscopy / 3D measurement / Image formation / Holography / Imageprocessing / 3DMeasurement / Imageformation / ホログラフィ / 3次元記録・再生 / 干渉計測 / 位相シフト法 / 顕微鏡 |
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| Research Abstract |
The purpose of this research is to develop a new method for 3-dimensional microscopy and shape measurement, in which interference patterns between a phase-shifted reference wave and object one are recorded by a CCD camera successively and analyzed to derive complex amplitude of the object wave that is subject to diffraction integral by a computer to reconstruct 3-dimensional distribution of complex amplitude at an arbitrary position. We developed 3-dimensional microscopy with and without microscope objective. It needs no mechanical focusing and delivers phase distribution directly that cannot be observed by conventional microscopy. It realizes resolution of a micrometer with a simple optical setup.
We also proposed a new method for topography of surfaces by which contour lines of both specular and diffuse surfaces can generated by subtraction of object phases corresponding to different angles of incidence. Surface shape measurement of small components such as screws and coins were successful.
In conclusion, a new technique in interferometry has been developed that enables 3-dimensional imaging and measurement with an extremely simple setup and quantitative evaluation. Computers complement limitations of opto-mechanical systems. Acceleration of recording and reconstruction will realize practical applications of this new technique.
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Report
(3 results)
Research Products
(15 results)
