Open AccessSimultaneous multi-piston measurement method in segmented telescopes
Author(s) -
Zhao Wang,
Qingchong Zeng
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.024540
Subject(s) - optics , piston (optics) , optical transfer function , coherence (philosophical gambling strategy) , aperture (computer memory) , physics , point spread function , telescope , zernike polynomials , amplitude , wavefront , acoustics , quantum mechanics
We propose a method to simultaneously detect the multi-piston between segments. The relation between the piston of any two segments and amplitude of the modulation transfer function (MTF) sidelobes (MTFnph) is derived. The piston can be retrieved by this relation after measuring the MTFnph. This method's capture range is the operating light's coherence length, the accuracy is 0.026λ (λ = 633 nm) RMS. The MTF model of a mask with sparse multi-subaperture configuration is established. The arrangement rules, to avoid the sidelobes overlapping, are obtained. The mask with a sparse 18 sub-aperture configuration is designed, which makes the MTF sidelobes distribution non-redundant.