Patent ID: 9207066
Filing Date: 2015-12-08
Classification: G01B

Abstract:
1. An assembly, comprising: a spatial filter arranged in a Cartesian coordinate system having orthogonal x, y, and z axes, the spatial filter including mask features that are more light transmissive and mask features that are less light transmissive, the mask features arranged along the x-axis in a flow direction of a flow path; a detector positioned to detect light emanating from at least one object in the flow path, the object having a width along the y-axis, a thickness along the z-axis, and a length along the x-axis, the light emanating from the object time modulated according to the mask features as the object moves along the flow path, the detector configured to generate a time-varying electrical signal in response to the detected light; and an analyzer configured to determine the width or thickness of the object based on the signal.