Method and apparatus for measuring a distance to an object from

Details Method and apparatus for measuring a distance to an object from Method and apparatus for measuring a distance to an object from

1992-09-25

1994-05-31

Rosenberger, Richard A.

Optics: measuring and testing

Range or remote distance finding

Triangulation ranging to a point with two or more projected...

356 4, G01C 300

Patent

active

053173740

ABSTRACT:
A prismatic viewing plate is situated across the focal axis between an object and an imaging device such as a camera capable of acquiring only a two dimensional image of the object. A characteristic of the prismatic plate is that it presents dual images of the object to the imaging device. Characteristic of the separation between the dual images is that it is dependent upon the distance of the object from the prismatic plate. These characteristics are employed to determine a range to the object by measuring the separation between the dual images, visually or by use of one of the many available machine vision techniques. A third dimension of a surface profile also can be obtained by scanning a spot of light over the object while separately viewing the spot through the prismatic plate and measuring the separation between dual images of the light spot at various points of the scan.

REFERENCES:
patent: 1715845 (1929-06-01), Konig
patent: 4009960 (1977-03-01), Feldman et al.
patent: 4260220 (1981-04-01), Whitehead
patent: 4542449 (1985-09-01), Whitehead
patent: 4791540 (1988-12-01), Dreyer, Jr. et al.
patent: 4993830 (1991-02-01), Jarrett

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