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Lighting Equipment Questions

Question Asked:

A recent machine vision application installed in one of our facilities have insufficiently accounted for ambient light in the manufacturing plant. I am looking for some generic template language or best practices for lighting that I can add to our equipment specifications to avoid this problem in the future.

2 Answers

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Rex Lee - CEO/President
Pyramid Imaging, Inc.
rlee [at] pyramidimaging [dot] com
(813) 984-0125

I do not know of anything generic that can be used other than to maybe say that the area where machine vision inspection is to occur should be enclosed to block out ambient light and only light needed for the inspection should be employed. I hope this is of some help to you.

Perry West - President
Automated Vision Systems, Inc.
perry [at] autovis [dot] com
(408) 267-1746

Steve -- From your question, you obviously know the following that I'll restate as an introduction to my remarks. Considering light sensed by the machine vision system, you have the engineered illumination and the ambient light. Engineered illumination creates the signal; ambient light creates the noise. The problem, then is signal-to-noise ratio. To improve the ratio, you need to either increase the signal or decrease the noise or some of both. I don't have template language for you as each application is very unique. It's difficult to specify ambient light (e.g., intensity, direction, spectrum, etc.), and this can change for several reasons. I suggest your buy-off test incorporate a provision to compare the vision system's operation under different lighting conditions (e.g., lights off and lights on) and require that the performance not change by more than some modest delta.

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