Optics: measuring and testing – By light interference – For dimensional measurement
Reexamination Certificate
2006-02-14
2006-02-14
Toatley, Gregory J. (Department: 2877)
Optics: measuring and testing
By light interference
For dimensional measurement
C356S512000
Reexamination Certificate
active
06999182
ABSTRACT:
A system for characterizing an aspheric surface with respect to an expected shape thereof, comprising a light source to emit light of desirable properties. A ferrofluid deformable mirror apparatus has a reflective surface being controllably deformable. The reflective surface is shaped as a function of the expected shape so as to reflect light in a known path toward a detector. Optical elements project light from the light source onto the aspheric surface such that light is reflected along an expected path if the aspheric surface has the expected shape. Light is reflected from the aspheric surface along an actual path. The optical elements project light on the reflective surface of the ferrofluid deformable apparatus such that light is reflected along the known path. A detector receives light reflected along at least one of the actual path and the known path to obtain an interference pattern as a function of the expected path. Means are provided for interpreting the interference pattern so as to characterize the aspheric surface with respect to the expected shape.
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Connolly Patrick
Institut National d'Optique
Toatley Gregory J.
Wallenstein Wagner & Rockey Ltd.
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