Method and equipment for measuring absorptance of light scattering materials using plural wavelengths of light
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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Abstract
In order to make it possible to measure the light absorption coefficient of various sorts of substances contained in a light scattering material with a high precision, the wavelength of light transmitted through the light scattering material is varied and the coefficient of light absorption is calculated, starting from a ratio of variations in the intensity of the transmitted light to variations in the wavelength.
121 Citations
14 Claims
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1. A method of measuring absorptance of a light scattering material, comprising the steps of:
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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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2. An apparatus for measuring absorptance of a light scattering material, comprising:
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means for 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; means for measuring a first intensity difference between the first and second laser light beams transmitted through said light scattering material; means for calculating a first ratio of a ratio of said first intensity difference to a wavelength difference between the first and second laser light beams, to the intensity of said laser light beam transmitted through said light scattering material; means for 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 selectively absorbed by the light scattering material; means for measuring a second intensity difference between the third and fourth laser light beams transmitted through said light scattering material; means for calculating a second ratio of a ratio of said second 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; means for determining a difference between said first ratio and said second ratio; and means for obtaining the absorptance of said light scattering material corresponding to said difference between the first and second ratios. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of measuring absorptance of a light scattering material, comprising the steps of:
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irradiating a light scattering material with first and second laser light beams respectively having different wavelengths from each other which are within a wavelength region that is selectively absorbed by said light scattering material; irradiating said light scattering material with third and fourth laser light beams respectively having different wavelengths from each other which are outside of the wavelength region that is selectively absorbed by the light scattering material; and obtaining the absorptance of said light scattering material by measuring the transmittance of said light scattering material for each of the first, second, third and fourth laser light beams.
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13. An apparatus for measuring absorptance of alight scattering material, comprising:
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means for irradiating a light scattering material with first and second laser light beams respectively having different wavelengths from each other which are within a wavelength region that is selectively absorbed by said light scattering material; means for measuring a first intensity difference between the first and second laser light beams transmitted through said light scattering material; means for irradiating said light scattering material with third and fourth laser light beams respectively having different wavelengths from each other which are outside of the wavelength region selectively absorbed by said light scattering material; means for measuring a second intensity difference between the third and fourth laser light beams transmitted through said light scattering material; and means for obtaining the absorptance of said light scattering material in accordance with the first and second intensity difference.
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14. An apparatus for measuring absorptance of a light scattering material, comprising:
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means for irradiating a light scattering material with first and second laser light beams respectively having different wavelengths from each other which are within a wavelength region that is selectively absorbed by said light scattering material; means for irradiating said light scattering material with third and fourth laser light beams respectively having different wavelengths from each other which are outside of the wavelength region selectively absorbed by said light scattering material; and means for measuring the transmittance of said light scattering material for each of the first, second, third and fourth laser light beams to obtain the absorptance of said light scattering material.
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Specification