Apparatus for detecting three-dimensional configuration of objec

Details Apparatus for detecting three-dimensional configuration of objec Apparatus for detecting three-dimensional configuration of objec

1989-10-23

1991-02-19

Westin, Edward P.

Optics: measuring and testing

By polarized light examination

With light attenuation

250560, G01B 1124, G01N 2186

Patent

active

049938355

ABSTRACT:
Disclosed is an apparatus for detecting the three-dimensional configuration of an object employing an optical cutting method. A light projector pulse-flashes slit-shaped light and causes the light to scan an object at a predetermined speed. An image sensor having a plurality of pixels is disposed in opposition to the object. An optical system forms on the image sensor an image of an optical cutting line formed on the surface of the object by the light. A difference detector detects the difference between the on- and off- levels of each of pulses of the image detected by the pixels of the sensor. A time calculator calculates the time at which the image has passed each of the pixels, on the basis of the difference detected by the difference detector. A configuration calculator calculates the three-dimensional configuration of the object on the basis of the calculated passage time and the scanning speed of the slit-shaped light. Since the difference between the levels of each pulse of the image is obtained, any optical signals resulting from a factor other than the pertinent pulses, such as influence by the background of the object, or a flash can be excluded, and the configuration can be detected with a high level of precision.

REFERENCES:
patent: 4794262 (1988-12-01), Sato et al.

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