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1994 Fiscal Year Final Research Report Summary

Wtra Sensitive PhaseRecovery Microscope Based on Fourier Iterative Method

Research Project

Project/Area Number 04452107
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 物理計測・光学
Research InstitutionWaseda University

Principal Investigator

KOMATSU Shinichi  WASEDA UNIVERSITY,SCHOOL OF SCIENCE AND ENGINEERING,PROFESSOR, 理工学部, 教授 (00087446)

Co-Investigator(Kenkyū-buntansha) OHZU Hitoshi  WASED AUNIVERSITY,SCHOOL OF SCIENCE AND ENGINEERING,PROFESSOR, 理工学部, 教授 (10063520)
Project Period (FY) 1992 – 1994
KeywordsPHASE RECOVERY / ITERATIVE ALGORITHM / FOURIER ITERATIVE METHOD / IMAGE PROCESSING / PHASE CONTRAST MICROSCOPE / LIGHT WAVE SENSING / VISUALIZATION TECHNIQUE
Research Abstract

Phase recovery experiments were conducted for the light waves transmitted through the model phase object whose film thickness is 90nm and greater than the one used in the previous year. The film thickness correspods to a phase delay of about lambda/14 at the wavelength of 633nm. The model object was fabricated by coating SiO2 film on a fused silica substrate in order to obtain a phase distribution of a line and space pattern whose linewidth was 10 mum.
The fundamental parameters of the phase distribution, i.e., the amplitude and period of the pattern was estimated with good accuracy.
Since the accuracy of phase recovery is greatly restricted if the measured Frauhofer diffraction pattern is contaminated with noise, an algorithm for estimating and eliminating the additive noise contained in the measured diffraction pattern was proposed, and its feasibility was successfully confirmed with computer simulation.

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Published: 1996-04-15  

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