Apparatus for measuring a glucose concentration
First Claim
1. An apparatus for noninvasively measuring a glucose concentration of a sample, the apparatus comprising:
- a first light source which projects at the sample radiation of a wavelength range including a first wavelength λ
1 at which absorption is dependent upon glucose concentration;
a second light source which projects at the sample radiation of a wavelength range including a second wavelength λ
2, different from the first wavelength λ
1, at which absorption has a temperature-dependent characteristic correlated with that in absorption of radiation of the first wavelength λ
1 ;
a photosensor which receives the two kinds of radiation which have been projected by the first and second light sources, and transmitted through or reflected by the sample, and generates a first electrical signal corresponding to a through-transmitted or reflected level of the radiation of the first wavelength λ
1 and a second electrical signal corresponding to a through-transmitted or reflected level of the radiation of the second wavelength λ
2 ; and
a calculator which calculates a glucose concentration based on the first and second electrical signals.
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Accused Products
Abstract
A non-invasive glucose concentration measurement apparatus includes: a light source which projects at the sample radiation of a wavelength range including a wavelength at which absorption greatly changes with glucose concentration but does not greatly vary with temperature; a photosensor which receives the radiation which have been projected by the light source, and transmitted through or reflected by the sample, and generates an electrical signal corresponding to a through-transmitted or reflected level of the radiation of the wavelength; and a calculator which calculates a glucose concentration based on the electrical signal. A more accurate glucose concentration can be obtained without the influence of temperature.
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Citations
14 Claims
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1. An apparatus for noninvasively measuring a glucose concentration of a sample, the apparatus comprising:
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a first light source which projects at the sample radiation of a wavelength range including a first wavelength λ
1 at which absorption is dependent upon glucose concentration;a second light source which projects at the sample radiation of a wavelength range including a second wavelength λ
2, different from the first wavelength λ
1, at which absorption has a temperature-dependent characteristic correlated with that in absorption of radiation of the first wavelength λ
1 ;a photosensor which receives the two kinds of radiation which have been projected by the first and second light sources, and transmitted through or reflected by the sample, and generates a first electrical signal corresponding to a through-transmitted or reflected level of the radiation of the first wavelength λ
1 and a second electrical signal corresponding to a through-transmitted or reflected level of the radiation of the second wavelength λ
2 ; anda calculator which calculates a glucose concentration based on the first and second electrical signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for noninvasively measuring a glucose concentration of a sample, the apparatus comprising:
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a light source which projects at the sample radiation of a wavelength range including a first wavelength λ
1 at which absorption is dependent upon glucose concentration and a second wavelength λ
2, different from the first wavelength λ
1, at which absorption has a temperature-dependent characteristic correlated with that in absorption of radiation of the first wavelength λ
1 ;a photosensor which receives the two kinds of radiation which have been projected by the light source, and transmitted through or reflected by the sample, and generates a first electrical signal corresponding to a through-transmitted or reflected level of the radiation of the first wavelength λ
1 and a second electrical signal corresponding to a through-transmitted or reflected level of the radiation of the second wavelength λ
2 ; anda calculator which calculates a glucose concentration based on the first and second electrical signals. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification