Device for contactless optical distance measurement in accordance with the static triangulation method

摘要

Device for contactless optical distance measurement in accordance with the static triangulation method with power supply and measuring instrument, laser in the power supply and, on the one hand, laser beam extractor and, on the other hand, lens with a focal length of f and measurement beam pickup in the measuring instrument. The distance to be measured corresponds to about twice the focal length 2f. Power supply and measuring instrument are optically connected by a plurality of optical fibres in the form of glass fibres and/or plastic fibres. In addition, a measurement beam receiver with a plurality of receiving elements, for example photodetectors in the form of photodiodes, is provided on the image side at a distance of about twice the focal length 2f. The measurement beam receiver is also arranged in the measuring instrument, the spatial coordinates (length, height, width) of which are all smaller than the focal length f. In the measuring instrument, a plurality of deflection mirrors, the distances of which complement each other to form about twice the focal length and which are set up both for the deflection of beams close to the axis and for the deflection of beams remote from the axis, is arranged in the beam path of the measurement beams between lens and measurement beam receiver. At least one of the deflection mirrors, preferably the one in front of the measurement beam pickup, is constructed as translating convex mirror. IMAGE