(a) A schematic of the experimental setup for measuring particle suspensions showing the optical hardware consisting of a fiber coupled LED, a CMOS image sensor camera and the polymer angular spatial filter (ASF). (b) Working principle of the ASF: scattered light from particle sample is collected up to specific cumulative cut-off angles defined by the geometrical dimension of the holes. Only two holes are represented for simplicity but in the initial experiments 23 holes with different diameter (i.e. cut-off angles) were used. (c) Lab prototype of optical hardware at ICFO. The complete device shipped to Leeds and Dresden for measurements was built in a proper case together with the control electronics.
by Rubaiya Hussain, Mehmet Alican Noyan, Getinet Woyessa, Rodrigo R. Retamal Marín, Pedro Antonio Martinez, Faiz M. Mahdi, Vittoria Finazzi, Thomas A. Hazlehurst, Timothy N. Hunter, Tomeu Coll, Michael Stintz, Frans Muller, Georgios Chalkias and Valerio Pruneri