title: Diffractive optical element based sensor for surface quality inspection of concave punches.
abstract: 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.
authors.affiliation: Department of Physics, University of Joensuu, Finland.
authors.forename: V
authors.initials: V
authors.lastname: Hyvärinen
authors.forename: R
authors.initials: R
authors.lastname: Silvennoinen
authors.forename: K
authors.initials: K
authors.lastname: Peiponen
authors.forename: T
authors.initials: T
authors.lastname: Niskanen
mesh_terms: D055095:Optics and Photonics; D013499:Surface Properties; D013607:Tablets; D013678:Technology, Pharmaceutical
chemical_list: D013607:Tablets