checking of matt and glossy surfaces
Perfect surfaces are a quality feature. Cracks, scratches, dents and stains reduce the value of a product or even make it unusable.
The area of application for surface testing is large, as is the number of different surface types. Is the surface matt, high-gloss or even reflective? Is it flat or curved? Is the surface smooth, rough or has a natural structure? For different surface types, completely different camera and lighting concepts have to be used. We have many years of experience in surface inspection and can help you select the right surface inspection solution for you.
A deflectometry system is usually used for glossy and reflective surfaces. The product is illuminated with different patterns. The camera records the patterns reflected from the product surface. Several result images are then generated from these reflection images using various image processing algorithms. Camera construction and image calculation are specially optimized for the product so that even the finest scratches, dents or inclusions become visible.
Our process is so fast that the inspection can take place in-line, i.e. during production. Even complex, non-planar objects can be inspected with several cameras and/or by adjusting the camera positions (e.g. in combination with a robot).
Dirt on matt surfaces is detected with classic lighting equipment. Here our systems convince by high resolution at highest speed.
Elevations and depressions (scratches, bubbles, etc.) are usually made visible by the casting of shadows on matt objects. In order to make errors in the image visible, the correct selection and arrangement of the lighting is crucial. In our laboratory, we have a large number of different lighting options at our disposal, and in a laboratory work, we determine the appropriate setup for your application.
- Identification of cracks, scratches, dents, inclusions, bubbles
- Identification of contamination
- Highest sensitivity for identification of smallest errors
- Checking even uneven surfaces
- Can be combined with other quality inspections
- In-line checking
- Long experience
- Laboratory tests
- Selection of the appropriate procedure
Testing of a shiny switch from the automotive interior. The symbolism is clearly visible in the brightness image on the left. Scratches and rough areas are only very faintly visible.
In the reflectivity image on the right, rough areas are clearly more pronounced and the finest scratches, which are not visible at all in the brightness image, become clearly visible.
Both images are generated with our deflectometry system in one cycle. The symbol is checked in the brightness image; the reflectivity image is used to detect scratches, roughened areas and impurities.