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Optical spectroscopy pathlength measurement system

  • US 20050020893A1
  • Filed: 10/28/2003
  • Published: 01/27/2005
  • Est. Priority Date: 08/18/2000
  • Status: Active Grant
First Claim
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1. A physiological monitor for measuring a blood constituent concentration within a tissue portion of a subject, said monitor comprising:

  • a polarized light source adapted to illuminate said tissue portion with an incident light beam;

    a magnetic field generator configured to impose a magnetic field on said tissue portion while illuminated by said light source, said magnetic field imparting a rotation in the plane of polarization of said incident light beam as it propagates through said tissue portion and emerges as a transmitted light beam;

    a polarimeter having an input responsive to said transmitted light beam and an output corresponding to said rotation; and

    a signal processor in communications with said polarimeter output so as to compute an output corresponding to a mean pathlength estimate of said tissue portion.

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