Publication Date:
2019-07-13
Description:
This presentation evaluates the parameters that affect visual inspection of cleanliness. Factors tested include surface reflectance, surface roughness, size of the largest particle, exposure time, inspector and distance from sample surface. It is concluded that distance predictions were not great, particularly because the distance at which contamination is seen may depend on more variables than those tested. Most parameters estimates had confidence of 95% or better, except for exposure and reflectance. Additionally, the distance at which surface is visibly contaminated decreases with increasing reflectance, roughness, and exposure. The distance at which the surface is visually contaminated increased with the largest particle size. These variables were only slightly affected the observer.
Keywords:
Quality Assurance and Reliability
Type:
Contamination and Coatings Workshop; Jul 17, 2007 - Jul 19, 2007; Columbia, MD; United States
Format:
application/pdf
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