Selecting the perfect lighting
Choosing the right lighting depends on a variety of factors which are defined by the test object, the features to be found, the camera used and the installation positions within your plant:
- How large is the field of view and the test object?
- How far away from camera and lighting is the object?
- Which lighting types and quantity of light is needed for proper illumination?
- How do the inspection features look like and with which lighting technique can they be detected?
- Which material properties and surface characteristics does the object have?
- Which colour does the part have?
- Which light colour is required? White, Red, Blue, Green? IR or UV radiation?
All commercially available lamp types can serve as illumination, as long as they fulfil their task and fit into the plant.
Halogen, LED and fluorescent lamps are used particularly frequently. Halogen spots and fluorescent lamps are especially suitable to illuminate large objects, such as vehicle bodies, etc., whereas LED products have rather been suitable to illuminate smaller objects for the last years. But especially in case of the latter, the light intensity has considerably increased in recent years, so that LEDs are used more frequently as illumination of larger objects.
Selecting the right lighting depends on a large number of physical factors which can often hardly be predicted. The approach "trial and error" is explicitly allowed and is the basis for a stable application.