Optical measuring device of close to the surface and its application to the notes of the profile of a surface

摘要

The invention relates to an optical measuring device of close to the surface and its application to the notes a profile. / p & & p & the device comprises a sender of the radiation 14 forming a light spot of the surface s and two detectors 30, 32 which are sensitive to the light flux sent back by the latter. The focusing means 26, 28 having focal lengths are associated with various detectors. The ratio between the signals q issued by the detectors is determine by a circuit 40. This ratio is representative of the distance d, independently of the angle of incidence of the incident beam and of the coefficient of reflection of the surface.