Diffractive optical element based sensor for surface quality of pharmaceutical tablets Silvennoinen, R. ; Peiponen, K. -E. ; Sorjonen, M. ; Ketolainen, J. ; Suihko, E. ; Paronen, P. Abstract Publication: Journal of Modern Optics Pub Date: July 1998 DOI: 10.1080/09500349808230645 Bibcode: 1998JMOp...45.1507S