Method and apparatus for detecting foreign body on object...

Details Method and apparatus for detecting foreign body on object... Method and apparatus for detecting foreign body on object...

2007-07-03

2007-07-03

Pham, Van (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C250S559450

Reexamination Certificate

active

10516023

ABSTRACT:
In an foreign body detection apparatus, an optical signal detection unit irradiates a light spot onto a surface of an object to be inspected while scanning the surface by employing the light spot in a predetermined direction, and receives a reflected beam from the surface of the inspected object to generate a photodetection signal corresponding to the light intensity of the reflected beam. A foreign body detection unit generates a foreign body detection signal appearing with respect to a leader and a trailer in the scanning direction of a foreign body adhering to the inspected object from the photodetection signal. The foreign body detection signal is obtained, for example, as a difference signal between the photodetection signal and a delayed photodetection signal with a predetermined delay time. A foreign body discrimination unit generates a foreign body discriminating signal indicating a region in which the foreign body is present from the foreign body detection signal.

REFERENCES:
patent: 4226539 (1980-10-01), Nakagawa et al.
patent: 62-14326 (1987-01-01), None
patent: 62-267651 (1987-11-01), None
patent: 62-297747 (1987-12-01), None
patent: 2-52242 (1990-02-01), None
patent: 2-163639 (1990-06-01), None
patent: 3-118453 (1991-05-01), None
patent: 4-221431 (1992-08-01), None
patent: 6-223384 (1994-08-01), None
patent: 10-79123 (1998-03-01), None
patent: 2001-256649 (2001-09-01), None

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