Diffractive optical element based sensor for surface quality inspection of concave punches.

@article{Hyvrinen2000DiffractiveOE,
  title={Diffractive optical element based sensor for surface quality inspection of concave punches.},
  author={V Hyv{\"a}rinen and Raimo Silvennoinen and Kai-Erik Peiponen and Taina Niskanen},
  journal={European journal of pharmaceutics and biopharmaceutics : official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V},
  year={2000},
  volume={49 2},
  pages={167-9}
}
Optical surface quality of concave shaped punches was investigated with a diffractive optical element based sensor. Image information of the present sensor was studied for the purpose of surface roughness and reflectance inspection. The robust sensor is proposed for off-line optical inspection of concave punches. 

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