Patent ID: 8284392

Claim:
A method for measuring a surface of a measurement object on the basis of the principle of deflectometry, the method comprising the following steps: providing a displaced, rotated or switched-over lighting device having at least one spatially linear source for electromagnetic radiation; providing an observation device having at least one camera sensitive to the electromagnetic radiation for recording a series of reflected images of the displaced, rotated or switched-over lighting device; rotating the at least one linear source for electromagnetic radiation or the measurement object through 90° with a rotary movement device; recording, with the observation device, the reflected images of the lighting device produced by reflection of the lighting device on the surface of the measurement object; and determining an inclination of the surface of the measurement object from a shape of the reflected images; wherein the at least one linear source for electromagnetic radiation is a plurality of lines applied to a background, the lines and the background having the same temperature, and the lines having a higher emission than the background due to a higher emission coefficient of a surface of the lines.