Method and apparatus for distinguishing regions where a material is present on a surface
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United States of America Patent
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-
Feb 4, 2003
Grant Date -
Nov 28, 2002
app pub date -
Jun 22, 1999
filing date -
Jul 13, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A property of the surface such as height is sensed as a function of position on the surface. A statistical spread in the sensed property as a function of the position is computed. Regions where the material is present are distinguished from other regions on the basis of the spread, e.g. conductor tracks on a PCB assembly are distinguished from a PCB substrate by having lower spread.
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