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SPATIAL MODULATION OF LIGHT TO DETERMINE OBJECT POSITION

  • US 20150276387A1
  • Filed: 02/14/2014
  • Published: 10/01/2015
  • Est. Priority Date: 02/14/2014
  • Status: Active Grant
First Claim
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1. An assembly, comprising:

  • at least one spatial filter having a length along a longitudinal axis of a flow path and a width along a lateral axis of the flow path, the spatial filter having mask features disposed at least partially along the length of the spatial filter and extending at least partially across the width of the spatial filter, the mask features including at least first mask features having a first transmission characteristic and second mask features having a second transmission characteristic different from the first transmission characteristic;

    at least one detector positioned to detect light with respect to a detection axis, the detection axis making a non-zero angle with respect to the longitudinal and lateral axes, the detected light emanating from at least one object and modulated according to the mask features as the object moves along the longitudinal axis, the detector configured to generate a time-varying electrical signal in response to the detected light, the time-varying electrical signal including information about a depth of the object in the flow path along the detection axis; and

    an analyzer configured to determine the depth of the object based on the signal.

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