Most common type of lighting in image processing. Light sources are LEDs. Positive features are an extremely long service life (up to 100,000 h), high mechanical robustness (shock and vibration resistance), wide spectral availability (from UV to IR, white), can be used in many types of lighting, small dimensions, simple electrical controllability, good switching and […]
Light that is visible to humans (visual) is electromagnetic radiation with wavelengths between around 380 and 760 nm. Below 400 nm, we speak of ultraviolet radiation (UV), which is extremely hard UV radiation down to 10 nm. The UV ranges of radiation, which also include sunlight, are referred to as UV-B from 280 – 315 […]
Light source for image processing systems. Different lighting types and → lighting techniques must be taken into account. Other properties to be considered are: Direction of propagation (diffuse, directional, parallel, telecentric), wavelength / color (UV, VIS, NIR, IR), → illuminance, homogeneity, → polarization, flashed or static. The type of lighting depends on what you want […]
The aim of the various lighting techniques is to achieve the greatest possible contrast of the object features to be detected in order to achieve efficient and reliable results for image processing or image analysis. The interaction of the lighting with the test object and its properties must be taken into account. The roughest subdivision […]
LED lighting is the most common type of lighting. Depending on the problem, halogen bulbs, fluorescent light, cold light sources (metal halide light sources with glass fiber light guides) or xenon flash lamps are also used. Although fluorescent lamps (with HF ballast) are inexpensive, they are rarely used because they age quickly (service life approx. […]
A line illumination (or bar illumination) describes a light source that produces a line-shaped light structure. Examples are light-emitting diode arrayswith a cylindrical lens or a laser with attachment optics. Fig.: Examples of line and bar lighting, naturally by Büchner. . They are used for targeted illumination for line scan camera applications (line illumination) or […]
MTBF (engl. for“Mean Time Between Failure“) is the statistical probability of a “random device failure”. Various standards such as SN 29500, IEC 61709, MIL HDBK 217 F, Belcore and others are available for calculating the MTBF value. The calculation always follows the same pattern. The standard provides a database with basic error rates of the […]
