GERAET ZUM BERUEHRUNGSLOSEN OPTISCHEN BESTIMMEN VON GEOMETRISCHEN ABMESSUNGEN EINES OBJEKTES

摘要

The invention relates to a device for the contactless determination of the geometrical dimensions by the shadow method of an object (7) which is in the beam path of a band of light of parallel beams with a laser light source (2) and an opto-electrical sensor (16) to receive the band of light and generate an electrical measuring signal and with two spaced, mirror-symmetrical prisms (8, 8') defining between them a measurement space (6) in which the object may be placed, in which the first prism (8) near the light source (2) deflects the light (a1, a2, i1, i2, s1, s2) to the second prism (8') which reforms the spread band to its original width. The edges of the shadow of the object (7) generate an electric voltage depending on the shading of the second prism (8') in the sensor (16), providing a measure of the dimension (d) of the object (7). The sensor is preferably a line sensor (CCD line sensor).