Optics: measuring and testing – Inspection of flaws or impurities
Reexamination Certificate
2011-05-24
2011-05-24
Pham, Hoa Q (Department: 2886)
Optics: measuring and testing
Inspection of flaws or impurities
C356S239700
Reexamination Certificate
active
07948617
ABSTRACT:
A foreign-particle detection system for use with an optical instrument having a transmissive window with a first side and a second side includes a radiation source to emit a radiation signal, a diffusing reflector to diffusively spread the radiation signal emitted by the radiation source over the first side of the transmissive window, a radiation detector to detect, at the second side of the transmissive window, the diffusively spread radiation signal transmitted by the transmissive window, and to generate a detected radiation signal based on the detected diffusively spread radiation signal, and a computation module communicatively coupled to the radiation detector to detect a presence of foreign particles on at least one of the first side or the second side of the transmissive window based on at least the detected radiation signal.
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Paris Sam
Shubinsky Gary
Fluke Corporation
Fredrikson & Byron , P.A.
Pham Hoa Q
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