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NUMERICAL RECONSTRUCTION METHOD FOR HIGHER SPATIAL RESOLUTION IN ELECTRON HOLOGRAPHY

Research Project

Project/Area Number 04650038
Research Category

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

Allocation TypeSingle-year Grants
Research Field 物理計測・光学
Research InstitutionMIE UNIVERSITY

Principal Investigator

OHSHITA Akinori  MIE UNIVERSITY, Faculty of Engineering, Professor, 工学部, 教授 (80023240)

Co-Investigator(Kenkyū-buntansha) HATA Koichi  MIE UNIVERSITY, Faculty of Engineering, Assistant, 工学部, 助手 (30228465)
SAITO Yahachi  MIE UNIVERSITY, Faculty of Engineering, Assosiate Professor, 工学部, 助教授 (90144203)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsElectron Holography / Numerical Reconstruction / Spatial Carrier Frequency / Phase Image / Thase Image / Interfarence Electron Microscopy / バイプリズム干渉縞 / フレネル回折縞
Research Abstract

To reconstruct a wave from an off-axis image hologram by an ordinary method using the Fourier transform, the carrier fringes should be less than one third of the required resolution. A new numerical reconstruction method is proposed which can be applied even when the carrier frequency does not satisfy this condition.
1. By averaging the intensity distribution of the electron hologram in the direction perpendicular to the biprism interference fringes, the incoherent intensity distribution which loses those fringes is produced numerically.
2. Subtaction between these two intensity distributions allows the reconstructed images to consist of spatial frequency as high as carrier frequency of the hologram.
3. The method is simpler than that proposed by Harada and Shimizu.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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