Phase diversity method and apparatus using fourier transform...

Details Phase diversity method and apparatus using fourier transform... Phase diversity method and apparatus using fourier transform...

2006-08-15

2006-08-15

Lee, Hwa (Andrew) (Department: 2877)

Optics: measuring and testing

By light interference

For dimensional measurement

C356S456000

Reexamination Certificate

active

07092103

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.

REFERENCES:
patent: 5404221 (1995-04-01), De Groot
patent: 5610707 (1997-03-01), Duncan et al.
patent: 5905591 (1999-05-01), Duncan et al.
Lampe, Lutz H.J., et al., “Noncoherent Continuous-Phase Modulation for DS-CDMA”, no date.
Gonsalves, Robert A., “Phase Retrieval and Diversity in Adaptive Optics”, Optical Engineering, vol. 21, No. 5, Sep./Oct. 1982.

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