Abstract
Lighting plays a major part in the efficient performance of industrial product inspection, and this paper describes the various ways in which light can be used most effectively for this purpose. The visual inspection problem is analysed and shown to involve design for the whole of the visual field. The value of natural and artificial light in revealing faults is discussed; general and local lighting problems are considered and various types of inspection booth are described. Under the heading of Inspection Lighting Techniques the ways in which diffuse lighting and directional lighting may be used are given, together with data on suitable light sources. 'Assisted Vision' using magnification and projection is described; whilst a section on 'Extended Vision' examines the use of colour, monochromatic and polarised light, UV radiation, photography and stroboscope devices.
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