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Spectroscopic method and apparatus for measuring sugar concentrations

  • US 4,883,953 A
  • Filed: 11/01/1988
  • Issued: 11/28/1989
  • Est. Priority Date: 11/17/1987
  • Status: Expired due to Term
First Claim
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1. A spectroscopic method for measuring concentrations of sugars in samples, which comprisesa first step wherein light intensity of a light source in an interferometer is set at a first prescribed value and outcoming light beams from said interferometer are emitted into an integrating sphere to irradiate a sample placed at a sample aperture of said integrating sphere,a second step wherein diffusely reflected light beams from said sample are detected by a photo detector,a third step wherein absorption spectrum of the sugar under measurement at a first depth in said sample is determined by processing electrical signals from said photo detector by a computer,a fourth step wherein the light intensity of the light source in said interferometer is set at a second prescribed value and absorption spectrum of the sugar under measurement at a second depth in said sample is determined in the same manner as in said first, second and third steps, anda fifth step wherein absorption spectrum of the sugar under measurement at a deeper region between said first and second depths in the sample is determined on the basis of the difference between the respective absorption spectrum determined in said third and fourth steps so that the concentration of the sugar under measurement in said deeper region in said sample can be determined on the basis of said absorption spectrum at said deeper region,the wavelengths for a use for said absorption spectrum being selected from a wavelength band of from 950 to 1,150 nm, from 1,150 to 1,300 nm, or from 1,300 to 1,450 nm.

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