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Advanced Imaging Magazine

Updated: July 8th, 2008 05:26 PM CDT

How to... Apply UV Lighting in Machine Vision Applications

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In the early years of machine vision UV excitation inspections used a monochrome camera. A monochrome camera can only give gray scale information in pixel intensity. Each image contains only information on the intensity of a pixel (fig. 1). A color camera adds to the formula by using wavelength in addition to intensity, which allows the inspection to make a decision on a certain color or wavelength (fig. 2).

New High Brightness HB LEDís in UV wavelengths have changed the usable distance and power of UV lights. UV HB LEDís in 1 watt packages are now available. Using UV HB LEDís in new lights increase the lights output by a factor 10x to 30x. UV HB LEDís can be strobed at an increased intensity for even brighter output for high speed inspections. Another advantage of UV HB LEDís is the ability to focus the light. Parabolic reflectors and lenses on the HB LEDís allow a more concentrated light pattern. The end result is more light in the area needed and longer working distances. Fluorescent black lights were the main source of UV in earlier years and the main disadvantage to these lights is the low output and wide angle of illumination. HB LEDís have changed this by providing a focused higher output illumination for use at greater distances.

Matt Pinter
Design Engineer
Spectrum Illumination
www.spectrumillumination.com



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