Optics: measuring and testing – By polarized light examination – With polariscopes
Patent
1991-12-11
1994-04-19
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With polariscopes
356365, G01J 400
Patent
active
053050908
ABSTRACT:
A birefringent inspection polariscope for inspecting relatively transparent objects for defects is disclosed as having a source of white light to emit light along a path and, positioned in the path, a retarder to diffuse light from the source thereof, a fixed polarizer to circularly polarize the light and a fixed, circularly polarizing analyzer to convert circularly polarized light emanating from the polarizer to plane polarized light. An inspection area, in which to position an object to be inspected, is provided between the polarizer and the analyzer; and a lens is positioned to magnify light emanating from the analyzer. Also provided is a half-wave plate that can be positioned in the path of light to provide a dark background field to facilitate photographic recording.
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GMI Engineering and Management Institute
Pham Hoa Q.
Rosenberger Richard A.
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