Measuring a hollow space by means of cylindrically symmetrical triangulation

An optical measuring device for a three-dimensional measurement of a hollow space formed in an object, comprising:

• a light source for emitting an illumination light along an illumination beam path;
• an optical deflection element which spatially structures the emitted illumination light such that an illumination line surrounding the longitudinal axis is generated on an inside wall;
• and
• a camera configured to detect the illumination line at a triangulation angle via a mapping beam path.

A method for a three-dimensional measurement of a hollow space formed in an object, comprising:

• introducing at least one object-side part of an optical measuring device into the hollow space to be measured, the optical measuring device having
• a light source for emitting an illumination light along an illumination beam path;
• an optical deflection element which spatially structures the emitted illumination light such that an illumination line surrounding the longitudinal axis is generated on an inside wall;
• and
• a camera configured to detect the illumination line at a triangulation angle via a mapping beam path;
• structuring the illumination light by the optical deflection element, such that an illumination line surrounding the longitudinal axis is generated on an inside wall of the hollow space;
• detecting the illumination line by a camera;
• and
• analyzing a distortion of the detected illumination line.