| Summary: | 碩士 === 元智工學院 === 機械工程學系 === 84 === A non-contact optical technique is developed for
measuring roughness of cold rolled products with oil
film coating in real-time. The technique is based upon
the laser scattering speckle pattern which is formed at
an observing plane due to the random wave- front plane, and
transformed into the specific configuration of the
surface roughness by using optical statistical theory.
Furthmore using image processing to eliminate the
influence from the oil film coating is adopted. The
influence involves the bright spot which is caused by
the incident light reflected directly from outer surface
of oil coating, and tortuous speckle which is caused by
refraction. The former disortion is solved by filterring
spot directly and filling the new value being available
from average gray around the spot, the latter distortion
is corrected by simulating the path of light
incident into oil film.
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