Optics: measuring and testing – By light interference – For dimensional measurement
Reexamination Certificate
2007-11-19
2008-11-25
Lyons, Michael A (Department: 2877)
Optics: measuring and testing
By light interference
For dimensional measurement
C356S511000
Reexamination Certificate
active
07456975
ABSTRACT:
A method for determining a spatial property of an object includes obtaining a scanning low coherence interference signal from a measurement object that includes two or more interfaces. The scanning low coherence interference signal includes two or more overlapping low coherence interference signals, each of which results from a respective interface. Based on the low coherence interference signal, a spatial property of at least one of the interfaces is determined. In some cases, the determination is based on a subset of the low coherence interference signal rather than on the entirety of the signal. Alternatively, or in addition, the determination can be based on a template, which may be indicative of an instrument response of the interferometer used to obtain the low coherence interference signal.
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Fish & Richardson P.C.
Lyons Michael A
Zygo Corporation
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