title: Theoretical analysis for moiré effect of circular gratings for volume optical computerized tomography.
abstract: Obtaining the radial derivatives of wavefronts in projections is a critical step for volume optical computerized tomography. In this paper, the moiré effect of two identical circular gratings in acquiring the first-order radial derivative of a wavefront is analyzed. Based on scalar diffraction theory, the formation mechanism of circular gratings' moiré fringes is derived. A more explicit analytical relation between moiré fringes of different diffraction orders and tested wavefront is obtained. The involved results will be useful for extracting the projection information that is used in three-dimensional reconstruction by volume OCT.
authors.affiliation: Department of Information Physics and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Wang
authors.forename: Yang
authors.initials: Y
authors.lastname: Song
authors.forename: Zhen-hua
authors.initials: ZH
authors.lastname: Li
authors.forename: Nan
authors.initials: N
authors.lastname: Sun
authors.forename: An-zhi
authors.initials: AZ
authors.lastname: He