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Spatial modulation of light to determine dimensional characteristics of objects in a flow path

  • US 9,207,066 B2
  • Filed: 02/14/2014
  • Issued: 12/08/2015
  • Est. Priority Date: 02/14/2014
  • Status: Active Grant
First Claim
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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.

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