Optics: measuring and testing – By light interference – Having wavefront division
Reexamination Certificate
2007-02-27
2007-02-27
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By light interference
Having wavefront division
C250S23700G
Reexamination Certificate
active
10871878
ABSTRACT:
The present invention provides a method and apparatus for reducing error in interferometric fringe stability and reproducibility in an interference fringe generator. In one aspect, the method for reducing error in interferometric fringe stability and reproducibility includes providing a light source, positioning a grating to receive light from the light source and positioning a projection lens having a focal length F to receive light from the grating. The projection lens projects the received light upon an object of interest positioned substantially at a distance d1from the lens. Typically the lens is positioned substantially at a distance d2from the grating. The values of d1, d2, and F are related by d2being approximately equal to d1F/(d1−F).
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PCT International Search Report for PCT Application No. PCT/US2004/019547.
Abbe Robert Cleveland
Hubbard William John
Shirley Lyle
Swanson Gary J.
Connolly Patrick
Dimensional Photonics International, Inc.
Guerin & Rodriguez LLP
Toatley , Jr. Gregory J.
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