With dark field illumination (see also direct incident light), the light source is positioned in such a way that direct reflections from a completely smooth surface do not hit the lens. This is achieved by shallow lateral incidence of light. This type of lighting gets its name from the fact that a completely smooth, reflective […]
The DataMatrix (one of the best known 2D or matrix codes) was developed by International Data Matrix (USA) in 1989. There are various development stages (ECC 0 to 200, ISS Data Matrix). The most commonly used version is DataMatrix ECC 200. The size of the rectangular code is variable. The symbol elements are square. The […]
The degree of soiling describes the environmental influences such as dust, moisture and aggressive substances that can affect a component in terms of insulation(air and creepage distances). IEC/EN 60664-1 and VDE 0110-1 define four degrees of contamination: – Pollution degree 1: There is no or only dry, non-conductive pollution. – Pollution degree 2: Only non-conductive […]
Similar to diffuse incident light, diffuse background lighting is achieved by using large-area light panels or surface lighting. The light source is covered with semi-transparent plastic or glass panels. In conjunction with stabilized DC lighting, these are suitable for surveying tasks. Example of diffuse backlighting (source: Vision Doctor) Büchner offers a large selection of backlights […]
With diffuse incident light, the light does not come from a clearly identifiable direction but is emitted from a large area. This can be achieved by using a diffuser (frosted glass pane) in front of a direct incident light and/or by using large surfaces. Other diffuse incident lights are coaxial lighting, dome lighting and tunnel […]
The DIN rail is a 35 mm mounting rail, also known as a top-hat rail or mounting rail. The dimensions of the rail are specified in DIN/EN/IEC 60715 (formerly DIN/EN 50022). The thickness of the rail can be 1 mm or 2.3 mm. Top-hat rail with and without equipment.
Direct incident light can be any form of lighting in which LEDsshine directly onto the object. Ring lighting is often chosen for this purpose. Line lighting, bar lighting or surface lighting are also possible. Disturbing reflections can occur on reflective object surfaces. A distinction is made between bright field illumination and dark field illumination. Büchner […]
One problem with diffuse backlighting is the occurrence of side light. For high-precision measurements, even better results can be achieved by using a telecentric backlight. As with the telecentric lens, this form of illumination has a parallel beam path. This is achieved by a collimator lens between the light source and the light panel.
The best diffuse incident light is obtained with dome lighting. They provide homogeneous light from all directions and are therefore often referred to as “cloudy day illumination”. They are ideal for shiny and/or uneven test surfaces, as scratches and unevenness are softly illuminated. Surfaces appear quite homogeneous and therefore structureless. It is important to keep […]