An integrated circuit is formed containing a metal-oxide ferroelectric thin film. The filter is then weighed to determine the weight of contaminants collected in the filter. Ejecting a fixed amount of powder from said powder container during at least one predetermined segment of rotational angles of said powder container, from the exit of said powder container onto said powder table, wherein said fixed amount is determined by the shape and size of the at least one opening inside said container. The N downstream interfaces are optically communicated with the splitting element.