Apparatus for blood glucose measurement based on Raman spectroscopy comprising diffracting grating
Blood glucose level measurement includes a light source configured to irradiate light to a subject; a monochrome part configured to separate wavelength components of the light that is reflected and scattered from the subject; a light receiver configured to receive the light transmitted via the monochrome part and to generate electrical signals based on the received light; and a processor configured to extract information on the blood glucose level of the subject based on a frequency shift of the light due to the Raman effect.
1. An apparatus for measuring blood glucose level, comprising:
a light source configured to irradiate light to a subject;
a diffracting grating configured to disperse the light reflected and scattered by the subject for a plurality of wavelength components;
a light receiver configured to detect a spectrum of the light dispersed by the diffracting grating and generates electrical signals based on the spectrum of the light; and
a processor configured to extract information on the blood glucose level of the subject based on a Raman shift of the light,
wherein the information on the blood glucose level is extracted based on each of at least three areas of peaks in the spectrum (i) between 1089 cm −1 and 1160 cm −1 , (ii) between 1115 cm −1 and 1140 cm −1 , and (iii) between 1120 cm −1 and 1130 cm −1 .
2. The apparatus of claim 1 , further comprising:
a first lens disposed in front of the light source to concentrate the light irradiated by the light source;
a first mirror disposed in front of the first lens to deflect the light concentrated by the first lens;
a first wavelength plate disposed downstream of the first mirror to adjust a polarization direction of the light deflected by the first mirror;
a second wavelength plate that adjusts a polarization direction of the light reflected and scattered from the subject;
a second mirror disposed downstream of the second wavelength plate to deflect the light adjusted by the second wavelength plate;
a second lens disposed in front of the second mirror to concentrate the light deflected by the second mirror; and
an optical filter disposed between the second lens and the diffracting grating to allow light of a predetermined wavelength band to be transmitted to the diffracting grating.