New raw material discrimination system based on a spatial optical spectroscopy technique Pilar B. García-Allende, Olga M. Conde, Ana M. Cubillas, Cesar Jauregui, Jose M. López-Higuera Sensors and Actuators A: Physical, Vol.135, Nº 2, pp 605-612, 15/04/2007 ISSN: 0925-4005