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Method and equipment for measuring absorptance of light scattering materials using plural wavelengths of light

  • US 5,239,185 A
  • Filed: 06/23/1992
  • Issued: 08/24/1993
  • Est. Priority Date: 06/22/1990
  • Status: Expired due to Fees
First Claim
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1. A method of measuring absorptance of a light scattering material, comprising the steps of:

  • irradiating a light scattering material alternately with first and second laser light beams respectively having slightly different wavelengths from each other which are within a wavelength region that is selectively absorbed by said light scattering material;

    measuring a first ratio of a ratio of an intensity difference between the first and second laser light beams transmitted through said light scattering material to a wavelength difference between the first and second laser light beams, to the intensity of said first laser light beam transmitted through said light scattering material;

    irradiating said light scattering material alternately with third and fourth laser light beams respectively having slightly different wavelengths from each other which are outside of the wavelength region that is selectively absorbed by the light scattering material;

    measuring a second ratio of a ratio of an intensity difference between the third and fourth laser light beams transmitted through said light scattering material to a wavelength difference between the third and fourth laser light beams, to the intensity of said third laser light beam transmitted through said light scattering material;

    determining a difference between said first ratio and said second ratio; and

    obtaining the absorptance of said light scattering material corresponding to said difference between the first and second ratios.

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