Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Casey Edward Emtman0
Andrew Michael Patzwald0
Benjamin Keith Jones0
Date of Patent
April 7, 2009
0Patent Application Number
105935740
Date Filed
May 12, 2004
0Patent Primary Examiner
Patent abstract
A displacement measurement device has a detector area which is larger than the area of the beam spot reflected from the measurement surface. The detector area is made larger than the size of the beam spot on the detector area, in order to accommodate shifts in the location of the beam spot due to changes in the precise locations of the components of the displacement measurement device. The subset of pixels in the detector area having advantageous correlation characteristics, is then selected to perform the correlation calculation, thereby reducing data processing time requirements.
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