Method and apparatus for estimating piston using a grism

Details Method and apparatus for estimating piston using a grism Method and apparatus for estimating piston using a grism

2005-06-21

2005-06-21

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Having wavefront division

Reexamination Certificate

active

06909512

ABSTRACT:
A method is provided for reducing the piston of neighboring first and second surfaces illuminated by polychromatic light transmitted from an unresolved-light source such that light transmitted or reflected from the first surface is out of phase with light respectively transmitted or reflected from the second surface, and the out-of-phase light is passed through a grism that generates a fringe pattern in the far-field. According to one exemplary embodiment, the method includes Fourier transforming the fringe pattern to generate a two-dimensional (2D) power spectrum; generating the absolute value of the 2D power spectrum to form an absolute value representation; displaying the 2D the absolute value representation on a computer display; and reducing the piston to affect rotation of the absolute value representation on the computer display and approximately align a central axis of the absolute value representation with an axis that indicates approximate alignment of the first and second surfaces.

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patent: 6649895 (2003-11-01), Wirth
Perrin et al. MIDI the 10 um Interferometer of the VLT. EAS Publications Series vol. 2, 2002.
Shi et al., DCATTDispersed Fringe Sensor: Modeling and Experimenting with the Transmissive Phase Plates,Jet ProOpulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, Goodard Space Flight Center, NASA, Greenbelt, MD 20771, 2000.

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