Abstract: A method and apparatus for precisely locating radioactive sources. A pair of visual cameras are oriented in directions so that they have all or part of their field of vision in common. The apparatus also includes an intermediate camera which is sensitive to the radiation to be measured. The visual cameras make it possible to define the position of the details of the environment by a triangulation method and another triangulation is carried out in order to know the position of the sources after having moved the apparatus. Photogrammetry software is used to accomplish these tasks easily.

Abstract: A system for measuring gap and mismatch by optical triangulation projects two parallel light planes onto the parts to be characterized so as to form two brightness lines. The three-dimensional profiles of the parts are calculated along the brightness lines. Raw values of gap and mismatch are calculated, preferably using particular reference points and lines. These raw values are then corrected by reference to the separation between the light planes and the change in position of a reference point of the profile of one of the parts from one brightness line to the other.