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Method for measuring scattering medium and apparatus for the same

  • US 5,529,065 A
  • Filed: 06/01/1994
  • Issued: 06/25/1996
  • Est. Priority Date: 06/02/1993
  • Status: Expired due to Term
First Claim
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1. A method of measuring a scattering medium comprising:

  • emitting light having a plurality of predetermined wavelengths, λ

    j, said wavelengths having transport scattering coefficients, μ

    S '"'"', in the scattering medium that are almost equal to each other;

    causing said light to be incident on the scattering medium at a light incidence position to propagate said light through the scattering medium;

    detecting said light which has propagated through the scattering medium at at least two photodetection points, with distances ρ

    i, between the light incidence position and each of the photodetection points being different from each other, to obtain at least three detected signals; and

    extracting internal information of the scattering medium with respect to each of said wavelengths of said light, by converting said at least three detected signals to at least three measured values, I(ρ

    i, λ

    j), and then performing arithmetic processing to said at least three measured values, I(ρ

    i, λ

    j), based on a simultaneous relation of the following equation;

    ##EQU7## where I(ρ

    i, λ

    j) represents each of the measured values,i is an integer running from one to an integer greater than one,j is an integer running from one to an integer greater than one,μ

    effj represents an effective attenuation coefficient for light having wavelength λ

    j
    
    
    space="preserve" listing-type="equation">μ

    .sub.effj =(3μ

    .sub.aj (μ

    .sub.aj +μ

    .sub.S '"'"')).sup.1/2, whereμ

    aj is an absorption coefficient for light having wavelength λ

    j

    S '"'"' is the transport scattering coefficient, andz0 =1/μ

    s '"'"'.

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