title: Absolute measurement of optical flats based on basic iterative methods.
abstract: Generalized basic iterative methods for absolute measurement of optical flats are presented. They are based on iterative scheme and can be classified into block Jacobi Successive Over-relaxation (SOR) method and block SOR method. Both methods are effective for solving the three-flat problem with pixel-level spatial resolution, without the usage of a fitting procedure. Compared to the block Jacobi SOR method, the block SOR method with an inexpensive choosing of relaxation factor (such as ω = 1.5) converges much faster and saves more computational costs and memory space without reducing accuracy. It has been proved by both simulation results and experimental results. The proposed basic iterative methods are generalized; can correctly reconstruct absolute figures with pixel-level spatial resolution; are easy to understand and implement; and computationally efficient.
authors.forename: Haiyang
authors.initials: H
authors.lastname: Quan
authors.forename: Xi
authors.initials: X
authors.lastname: Hou
authors.forename: Fan
authors.initials: F
authors.lastname: Wu
authors.forename: Weihong
authors.initials: W
authors.lastname: Song