Method and apparatus for detecting the position of an object

Details Method and apparatus for detecting the position of an object Method and apparatus for detecting the position of an object

1989-07-28

1990-11-20

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

2504911, 356401, G01B 1100

Patent

active

049714449

ABSTRACT:
A method of detecting the position of an object with respect to a predetermined standard position, includes detecting a signal concerned wtih the object, subjecting the detected signal and a predetermined reference signal to correlation processing to form a correlation signal, and detecting the position of the object with respect to the predetermined standard position, in accordance with the formed correlation signal.

REFERENCES:
patent: 4219719 (1980-08-01), Frosien et al.
patent: 4487505 (1984-12-01), Nakano et al.
patent: 4515481 (1985-05-01), Yamada et al.
patent: 4553845 (1985-11-01), Kuroki et al.
patent: 4641035 (1987-02-01), Suzuki et al.
patent: 4679942 (1987-07-01), Suwa et al.
patent: 4803644 (1989-02-01), Frazier et al.

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