Method and device for calibrating an optical system, distance determining device, and optical system

A method for calibrating a distance determining device for determining a distance or a position vector between an optical system comprising an image optic and a camera and an object, comprising the steps,

• a) providing a detecting system, which comprises a plurality of marking elements, a measuring camera for detecting the spatial position of the marking elements, and means for projecting a light structure onto a calibration pattern;
• b) arranging the marking elements on the optical system and/or the distance determining device;
• c) providing a carrier to which calibration pattern is connected and/or which forms a calibration pattern;
• d) projecting a light structure onto the calibration pattern or the carrier forming the calibration pattern;
• e) detecting the marking elements, the calibration pattern and/or carrier marking elements arranged on the carrier by means of the measuring camera;
• f) detecting the light structure on the calibration pattern using the image optic and camera of the optical system;
• g) determining the spatial position of the marking elements and thus of the optical system using data of the measuring camera;
• h) determining coordinates of the calibration pattern in a first coordinate system associated with the measuring camera using data of the measuring camera;
• i) determining coordinates of an image of the light structure onto the calibration pattern in a second coordinate system associated with the image plane of the camera of the optical system;
• and
• j) calibrating the distance determining device using the determined coordinates of both coordinate systems and the determined spatial position of the optical system.