Phase diversity method and apparatus using fourier transform spectroscopy
US7092103B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2004 |
| Grant date | Aug 15, 2006 |
| Priority date | — |
| Expiry date | Feb 3, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for reducing a piston between a plurality of optical-collection devices configured to operate as a single optical device, such that the optical-collection devices are configured to capture select portions of a wavefront. The method includes pistoning an adjustable-optical path of at least one of the optical-collection devices through a plurality of steps; collecting a set of focused images and a set of defocused images for each step; Fourier transforming the first and second sets of images to generate respective first and second sets of spectral information for the wavefronts; deriving a set of wavefront errors based on the first and second sets of spectral information using a phase diversity algorithm; and deriving a piston value for the piston from the wavefront errors using a multi-color interferometry algorithm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.