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Absorption information measuring method and apparatus of scattering medium

  • US 6,233,470 B1
  • Filed: 10/08/1999
  • Issued: 05/15/2001
  • Est. Priority Date: 08/30/1996
  • Status: Expired due to Term
First Claim
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1. A method of measuring absorption information of a scattering medium, said method comprising:

  • applying modulated light having a predetermined modulation frequency component to form a spot shape incident on a surface of a scattering medium comprising a measured object;

    acquiring respective measurement signals by receiving said modulated light having propagated inside said measured object at one or both of a plurality of different times and a plurality of positions on said surface of said scattering medium;

    detecting, from each of said respective measurement signals, respective signals of said modulation frequency component;

    obtaining, from said respective signals of said modulation frequency component, amplitude components and phase component slopes against modulation angular frequency; and

    calculating a difference between absorption coefficients of said measured object based upon a predetermined relation among said amplitude components, said phase component slopes against modulation angular frequency, and a difference between absorption coefficients corresponding to different ones of said respective measurement signals.

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