2002 Fiscal Year Final Research Report Summary
Research on Optical Reproduction of Sounds from Old Wax Phonographs Using a Low-Coherence Light Source
| Project/Area Number |
13650049
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Kushiro National College of Technology |
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Principal Investigator |
NAKAMURA Takashi Dept. of Electronic Engineering, Professor, 電子工学科, 教授 (40198213)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Wax Phonograph / Optical Reproduction / Laser / Low Coherence |
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| Research Abstract |
Illumination system using a LED was performed by selecting a LED with circular shaped, uniform radiation from its surface, and without electrodes on radiation area. The light power from the LED was so low that this system can be provided only in a dark room.
Low coherence LD illumination system was performed by ON-OFF control of a LD's drive current. By this way, temporal coherence of light emitting from a LD becomes lower than that of a stable drive current.
Portable reproduction system was accomplished by using a brushless AC motor and current chopper drive for rotational and translational movements, respectively.
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