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Method and apparatus for non-invasive measurement of blood sugar level

  • US 5,533,509 A
  • Filed: 04/10/1995
  • Issued: 07/09/1996
  • Est. Priority Date: 08/12/1993
  • Status: Expired due to Term
First Claim
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1. A method for non-invasive measurement of blood sugar levels comprising the steps of:

  • providing light which is intensity-modulated with a plurality of intensities as well as being wavelength-modulated;

    applying the modulated light to an examined portion;

    detecting an intensity of reflected light from said examined portion and an intensity of the incident light onto said examined portion for each intensity of said modulated light;

    detecting the ratio of an intensity of said reflected light and said incident light;

    detecting the rate of change in said ratio with respect to the change in wavelength due to the wavelength modulation;

    extracting a derivative spectrum of an absorbance spectrum of glucose in said examined portion, anddetecting the blood sugar level of said examined portion.

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