System and method for efficient surface measurement using a laser displacement sensor
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United States of America Patent
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Sep 15, 2020
Grant Date -
Aug 29, 2019
app pub date -
Aug 6, 2018
filing date -
May 22, 2013
priority date (Note) -
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Abstract
This invention provides a system for measuring displacement of an object surface having a displacement sensor that projects a line on the object surface and receives light from the projected line at an imager in a manner defines a plurality of displacement values in a height direction. A vision system processor operates on rows of imager pixels to determine a laser line center in columns of imager pixels in each of a plurality of regions of interest. Each region of interest defines a plurality of rows that correspond with expected locations of the projected line on the object surface. A GUI can be used to establish the regions. In further embodiments, the system generates grayscale images with the imager. These grayscale images can be compared to a generated height image to compensate for contrast-induced false height readings. Imager pixels can be compared to a reference voltage to locate the line.
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