which type of lighting is useful for machine vision system at present?

The types of lighting used vary greatly - as do the types of machine vision applications. They differ in the source of light (such as halogen bulb, tungsten lamp, LED or laser), in the geometry used (such as line light, panel) and in the operational mode (continuous wave or flashed). Sometimes, light forming optics may be used. All of this depends on the machine vision task at hand and therefore no general statement can be made about which technology is the most current or best one. It is generally true, however, that illumination is a key factor that determines the performance of the whole system to a great extent. Please contact us with a description of the specific details of your machine vision tasks at via email to: info@emva.org. We will then be able to provide a contact which will be able to help you with your specific machine vision/illumination application.