Position fixing apparatus with radiation sensor

Details Position fixing apparatus with radiation sensor Position fixing apparatus with radiation sensor

1993-04-30

1995-04-18

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

2502061, 250237G, G01B 1100

Patent

active

054083230

ABSTRACT:
Apparatus for the determination of the position of an object included a radiation sensor (16) sensitive to spatial variations, in at least one direction, of intensity of radiation received from a region of observation (6). A mask (14) attenuates the radiation in a random spatially-variant manner whilst sampling (18) and calculating means (20) determine the autocorrelation function of the received pattern with previously stored values to sense the position of an object (8).

REFERENCES:
patent: 3858201 (1974-12-01), Foster
patent: 3882482 (1975-05-01), Green et al.
patent: 4857721 (1989-08-01), Dunavan et al.
Patent Abstract of Japan, vol. 013, No. 037 (P-819) 27 Jan. 1989 & JP,A,63 235 869 (Hitachi) 30 Sep. 1988--see abstract.

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