Abstract
In order to measure 3-D model shapes for injection molds, the optical 3-D profile sensor is proposed in this paper, in which the distance between two light spots separated by passing laser light scattered from a target surface through a lens system with two slits is proportional to the displacement of surface in optical axis. This sensor can measure the displacement of a target surface to be measured in a wide range of 300 mm in a non-contact manner with high resolution of less than 0.1% for the full-range and without causing a dead angle (shadow effect), even if the target surface is a free-form surface with a complicated shape including a steep inclined surface up to ±75 degrees. Moreover, there is no need for the sensor to be moved by a servo mechanism, so that it is possible to detect a point to be measured at a short time of 8 ms. The developed automatic measuring system consisting of the 3-D profile sensor, CCD drive unit, main-computer, pulse generator, X-Y table unit and NC/X-Y table can measure a complicatedshaped wood model to be 160 mm in length, 100 mm in width and 110 mm in height, at a high speed of 15.5 min per 8 925 points to be measured under the conditions of 2 m/min table speed and 2 mm sampling interval.
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