Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Reexamination Certificate
2007-07-24
2007-07-24
Tarcza, Thomas H. (Department: 3662)
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
C356S029000, C345S166000
Reexamination Certificate
active
11268898
ABSTRACT:
A signal processor and method are provided for detecting movement of a surface relative to an optical sensor having an array of photosensitive elements. Generally, the method involves: (i) sampling each of a number (M) of phase signals from the photosensitive elements, each of the M signals having a magnitude (Ai) and including a tracking signal at a frequency being tracked and a background signal at other frequencies that offsets the tracking signal, where i, an index of the signals, is a whole number between 0 and M-1; (ii) eliminating the offset to the tracking signal due to the background signal to generate M non-offset phase signals having a magnitude (A′i); (iii) adjusting phase angles (θi) of the non-offset phase signals to generate M weighted phase signals (A′iθ′i); and (iv) combining each of the M weighted phase signals (A′iθ′i) to generate an average weighted phase having a phase angle (θ), that when tracked over time indicates a direction and velocity of the movement of an image of the surface mapped to the array.
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Todoroff Brian D.
Xu Yansun
Alsomiri Isam
Nuttle William E.
Silicon Light Machines Corporation
Tarcza Thomas H.
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