Patent ID: 8875562
Filing Date: 2014-11-04
Classification: B01D,G01N

Abstract:
1. A system for locating defects in a substrate adapted to separate fluids having at least two surfaces, a first and a second surface, which are isolated from one another and wherein the substrates or devices containing the substrates have an exit point for fluids passing through the substrate, the system comprising: a) a particle generator capable of generating particles of a controlled size which is greater than the size of particles which the substrate is adapted to pass from the first surface to the second surface; b) a system for creating a pressure differential between the first and the second surface of the substrate; c) a light source generating a diffuse cone of light; d) a baffle having a plurality of flow passages that particles can pass through; e) a closed flow path from the particle generator to the first surface of the substrate; wherein the light source is directed in the direction of the second surface of the substrate or the exit of the substrate, the angle of the direction of the light from the light source, as measured by a vector at the center of the light pattern from the light source in relation to the plane of the second surface of the substrate is between about 2 degrees and about 85 degrees; and f.) an imaging device adapted to capture images of light emitted from the light source and reflected from particles gassing from the first surface to the second surface or through the exit of the substrate.