Working conditions
When referring to working conditions we refer to all those physical and environmental aspects that will condition us when choosing the type of light to inspect an application. In a production line, it is sufficient to choose the type of lighting, but also will have to determine the structure of the light, the working distance, the intensity, the speed of inspection, the total area to be illuminated or the place of placement.
For example, we can determine that an object needs a diffuse light for getting an optimum inspection; however it has a limited access position that prevents from using it. We will have to consider other options.
One of the most important factors to consider are the conditions of light and temperature, because they have a great impact on the quality of the inspection, especially with white light (multi-spectral). This quality can be affected by ambient or workplace lighting or even other inspections nearly. The solution comes through filters placement, strategic position of the equipment or strobe lighting with short and very intense pulses to dissipate the influence of ambient light. What is the best solution to each problem will have to be evaluated on each project.
The surface of the object of inspection and how light interacts with it, is one of the main factors to consider, as it will need to be evaluated whether the surface is glossy, matte, irregular or flat, and choose the appropriate lighting to minimizes these effects when illuminates the object to be inspected.
For instance, the light does not interact equally with the curved surface of a can of soda than with a flat bright coin.
