Zebra Deflectometry System
Defelectometry measuring method in use for surface measuring systems
The measurement principle of deflectometry is based on the reflection of regular geometrical pattern on the object´s surface which is under inspection.
The shape of the object´s surface leads to a distortion of the reflected pattern. The distortion is detected using a camera. The resulting measurement data are the local surface angle. The data can be used to calculate the surface gradients, local curvature or the 3D-shape of the object.
The main part of the setup is a LCD-monitor, which is used as coordinate area. Different image pattern with regular fringes are displayed and captured with the help of a camera.
The advantages of this measurement principle are as follows: High resolution (nanometer-scale); robust against environmental disturbances like vibrations – hence usually no optical table is needed.
For special applications an additional confocal distance sensor can be integrated, leading to an absolute precision of the object´s shape of up to 100nm (depending on the size of the measurement area)
The system includes an intuitively operable user interface. The user can acquire directly the relevant data of an optical surface, for ex. Dioptre or the extraction of profiles
The system can be adapted to special applications:
- Measurement of optical components (lenses, eye glasses, concave mirrors,…)
- Measurement of mirrors for solar power plants
- Surface inspection of injection moulding parts (quality control)
- Measurement of micro parts