Three-dimensional shape measurement apparatus

Details Three-dimensional shape measurement apparatus Three-dimensional shape measurement apparatus

1988-10-25

1990-02-13

Westin, Edward P.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

250560, 356376, A61B 314, G01B 1124

Patent

active

049001442

ABSTRACT:
A three-dimensional shape measurement apparatus uses a laser beam to illuminate an object. The light reflected from the object is processed to obtain information about the shape of the object in three dimensions. As the beam moves over contour features of the object, there is a corresponding displacement of the focal point of the light reflected back from the object which is calculated to convert it to depth-wise shape information. The apparatus includes a laser light source; deflectors for scanning the laser beam at a set frequency; an optical system for projecting the laser beam scanned by the optical deflectors at the object; detection slits arranged parallel to the direction in which the reflected light is scanned and facing the object along on an optical axis that is perpendicular to the direction of the scanning by the optical deflectors, the slits being placed a certain distance from a point that is optionally conjugate with the object; photosensors for detecting light passing through the detection slits; and a signal processor to eliminate the effect of the reflection characteristics of the object.

REFERENCES:
patent: 4213678 (1980-07-01), Pomerantzeff et al.
patent: 4423931 (1984-01-01), Shapiro
patent: 4715703 (1987-12-01), Cornsweet et al.

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