Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-05-08
1988-12-27
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356430, 356237, G18
Patent
active
047942657
ABSTRACT:
An apparatus and method for uniquely detecting pits on a smooth surface by irradiating an area of the surface; separately sensing radiation scattered from the surface in the near-specular region indicative of a pit and in the far-specular region indicative of a flaw and producing signals representative thereof; normalizing the near-specular signal with respect to the far-specular signal to indicate a pit; and discriminating the near-specular components of the normalized signal representative of surface pits.
REFERENCES:
patent: 4172666 (1979-10-01), Clarke
patent: 4184082 (1980-01-01), Peoples
patent: 4492477 (1985-01-01), Leser
patent: 4583861 (1986-04-01), Yamaji et al.
patent: 4598997 (1986-07-01), Steigmeier et al.
Broude Sergey V.
Chase Eric T.
Nishine Koichi
Ormsby Jay L.
Quackenbos George S.
Denninger Douglas E.
Iandiorio Joseph S.
QC Optics, Inc.
Shami Khaled
Westin Edward P.
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