1. Roughness measurement of paper using speckle
- Author
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Josep Pladellorens, Abdiel Osvan Pino, Jesus Caum, and Oriol Cusola
- Subjects
Microscope ,Materials science ,Covariance function ,business.industry ,paper ,General Engineering ,Speckle noise ,Surface finish ,Atomic and Molecular Physics, and Optics ,law.invention ,Speckle pattern ,Optics ,law ,Surface roughness ,Beam expander ,Profilometer ,speckle ,business ,roughness - Abstract
We present a method of measure of the roughness of the paper based on the analysis of a speckle pattern on the surface. Images of speckle over the surface of paper are captured by means of a simple configuration using a laser, beam expander, and a camera charge-coupled device (CCD). Then we use the normalized covariance function of the fields, leaving the surface to find the roughness. We compare the results obtained with the results obtained with a confocal microscope and the Bendtsen method that is a standard of the paper industry. This method can be considered as a noncontact surface profiling method that can be used online. We present a method of measure of the roughness of the paper based on the analysis of a speckle pattern on the surface. Images of speckle over the surface of paper are captured by means of a simple configuration using a laser, beam expander, and a camera charge-coupled device (CCD). Then we use the normalized covariance function of the fields, leaving the surface to find the roughness. We compare the results obtained with the results obtained with a confocal microscope and the Bendtsen method that is a standard of the paper industry. This method can be considered as a noncontact surface profiling method that can be used online.
- Published
- 2011