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Filtered detector array for optical patient sensors

  • US 9,037,204 B2
  • Filed: 09/07/2011
  • Issued: 05/19/2015
  • Est. Priority Date: 09/07/2011
  • Status: Active Grant
First Claim
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1. A physiological sensor, comprising:

  • an emitter configured to emit two or more wavelengths of light having a first polarization into the tissue of a patient;

    a charge coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) photodetector array comprising a plurality of photodetectors, wherein each photodetector is configured to receive the light from the tissue of the patient and to produce a corresponding output signal; and

    one or more filter layers disposed over the plurality of photodetectors, wherein a first portion of the one or more filter layers is configured to only allow light associated with a first physiological measurement to reach a first portion of the plurality of photodetectors, wherein a second portion of the one or more filter layers is configured to only allow light corresponding to a second physiological measurement to reach a second portion of the plurality of photodetectors, and wherein the one or more filter layers comprise a graded polarization filter layer configured to block a greater amount of light of the first polarization from reaching a portion of photodetector array disposed nearest the emitter.

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