APPARATUS FOR BLOOD GLUCOSE MEASUREMENT BASED ON RAMAN SPECTROSCOPY COMPRISING LINEAR VARIABLE FILTER
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 linear variable filter that filters the light reflected and scattered by the subject, wherein the linear variable filter is configured such that different areas thereof pass different wavelength components of light; and
a light receiver configured to receive the light filtered by the linear variable filter and generate electrical signals based on the filtered 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.
2 . The apparatus of claim 1 , further comprising:
a rotation member coupled to the linear variable filter; and
a filter feeding member coupled to the rotation member,
wherein the filter feeding member is configured to rotate the rotation member, and
wherein rotation of the rotation member is configured to move the linear variable filter, thereby allowing the different areas to be selectably disposed in front of the light receiver.
3 . 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 linear variable filter to allow light of a predetermined wavelength band to be transmitted to the linear variable filter.