Abstract
This paper introduces surface roughness interferogram processing system and how to use it to measure surface roughness by computer based image processing technology. The system can measure ra<0.2 um milti-gloove specimen and testing surface by processing a white light interferogram and measure H<5 um step height by processing a white interferogram and sodium light interferogram. former for the height measurement and later for CCD calibration with the advantages of absolute, non-contact, high-speed and automation.
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