Apparatus for surveying the surface of an object by...

Details Apparatus for surveying the surface of an object by... Apparatus for surveying the surface of an object by...

G - Physics

01

S

354/25, 343/5

G01S 17/36 (2006.01) G01B 11/25 (2006.01)

Patent

CA 2007044

ABSTRACT OF THE DISCLOSURE For sensing the surface of an object, a number of gratings with linear line patterns of different periods on a common carrier are successively projected on to the surface. Images of the line patterns deformed at the object surface are detected and stored by a television camera and evaluated by an electronic circuit. The evaluation comprises computing, from the residual phases of the object points within each fringe of the linear pattern, the absolute heights of these points with respect to a common reference plans. 17

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