DEVICE FOR CONTACTLESS INSPECTION OF LINEAR DIMENSIONS OF THREE-DIMENSIONAL OBJECTS

摘要

The invention relates to measurement technique and can be used for visualising profiles of three-dimensional objects. The inventive device performs a structured lighting method and comprises a light emission source, a transparency embodied in the form of a spatial light intensity modulator, an objective lens projecting the image of a line structure appearing on the surface of the controlled object and distorted by the surface relief of the controlled object, an additional objective lens projecting the transparency image on a controlled surface, a photorecorder transforming the image projected by the objective lens into a digital image, a digital electronic unit translating the digital images recorded by the photorecorder into values of co-ordinates of the controlled surface according to a predefined formula. Since the structured lighting is embodied in the form of aperiodical band system, each band distorted by the surface relief of the controlled object is unambiguously identified making it possible to unambiguously calculate the relief height and the corresponding pair of co-ordinates.