Patent ID: 6449035
Filing Date: 2002-09-10
Classification: G01N

Abstract:
An apparatus using a tacky sheet for detecting particulate contamination on a surface, comprising:an applicator means which adheres a portion of the tacky sheet to the surface; a removal means which peels the portion of the tacky sheet from the surface; an optical detector which inspects the portion of the tacky sheet to produce scattering location data, whereby the scattering location data corresponds to locations of defects and particulate contamination on the portion of the tacky sheet; and a control means, the control means acquiring first scattering location data from the portion of the tacky sheet prior to adhering the portion of the tacky sheet to the surface, the control means acquiring second scattering location data from the portion of the tacky sheet after adhering the portion of the tacky sheet to the surface, the control means subtracting first scattering location data from corresponding second scattering location data to make third scattering location data whereby third scattering location data corresponds to locations of particulate contamination transferred to the tacky sheet from the surface.