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Multiple wavelength sensor substrate

  • US 8,255,027 B2
  • Filed: 07/19/2010
  • Issued: 08/28/2012
  • Est. Priority Date: 03/01/2005
  • Status: Active Grant
First Claim
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1. A physiological sensor comprising:

  • a plurality of emitters configured to transmit optical radiation having a plurality of wavelengths in response to a corresponding plurality of drive currents;

    a thermal mass disposed proximate the emitters so as to stabilize a bulk temperature for the emitters; and

    a temperature sensor thermally coupled to the thermal mass, the temperature sensor providing a temperature sensor output responsive to the bulk temperature so that the wavelengths are determinable as a function of the drive currents and the bulk temperature; and

    and an optical filter, wherein the optical filter attenuates at least a portion of a wavelength spectrum so as to compensate for an imbalance in an attenuation of the plurality of wavelengths by the tissue site.

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