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Direct light differential measurement system

  • US 10,426,387 B2
  • Filed: 06/24/2016
  • Issued: 10/01/2019
  • Est. Priority Date: 06/25/2015
  • Status: Active Grant
First Claim
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1. A measurement system for measuring blood characteristics, comprising:

  • an emitter emitting light at a plurality of wavelengths from a first side of a blood flow channel to a second side of the blood flow channel;

    a sensor on the second side of the blood flow channel;

    a reference sensor on the first side of the blood flow channel positioned to receive the light directly from the emitter, the reference sensor located proximate to and in line of sight of the emitter;

    a mask on the first side of the blood flow channel positioned to;

    block light from external and externally reflected sources to the reference sensor, the blocked light including reflected light of the emitter, andallow the light directly from the emitter to the reference sensor; and

    a controller configured to compensate measurements of light by the sensor based upon measurements of light by the reference sensor.

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