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Method for analysing a diffusing sample by time resolution measurement

  • US 20030107742A1
  • Filed: 10/31/2002
  • Published: 06/12/2003
  • Est. Priority Date: 05/18/2000
  • Status: Active Grant
First Claim
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1. A method of analyzing a scattering sample by time resolved measurement of the light scattered within this sample, characterized in that it comprises the steps of:

  • a) illuminating the sample with a temporally coherent and wavelength-modulated incident light beam;

    b) producing a succession of interference signals, recorded over a time interval, by superposition of the scattered light obtained at the output of the sample and of light taken from the incident beam illuminating the sample;

    c) combining each interference signal with a reference signal (Ref(t,τ

    0)) generating a time gate centered on a predetermined delay (τ

    0) in order to produce a signal characteristic of the predetermined delay (τ

    0);

    d) extracting the d.c. component of each signal characteristic of the predetermined delay (τ

    0);

    e) applying a nonlinear function to each of the d.c. components of the signals characteristic of the predetermined delay (τ

    0); and

    f) carrying out a linear combination of each of the nonlinear function images of the d.c. components of the signals characteristic of the predetermined delay (τ

    0).

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