Optical comparator for spatial coordinates - projects two grid patterns on surface of tested object from optical systems fixed w.r.t. reference point

摘要

Images of two grid patterns are produced on the tested object by two light beams (13,14) and two optical systems in a fixed position w.r.t. a reference point which defines the reference object position. The optical axes converge towards the reference object (2). The second grid pattern (8) is the image of the first pattern produced by the first optical system on the reference object, and projected from there on the tested object (9) by the second optical system. The first grid pattern (5) consists of opaque zones arranged in a chess-board pattern. Two light beams of different colours are used and kept separated by corresponding filters (11,12).