Portable apparatus for noninvasively measuring blood glucose level and operating method thereof

A portable apparatus for noninvasively measuring blood glucose levels, comprising:

• a light source which emits light with a wavelength range absorbed into or scattered by glucose;
• a photodiode detector which includes at least one light receiving element, for converting light received by the light receiving element into an electrical signal;
• and
• a processor which is connected to the photodiode detector and configured to (a) collect a first signal value from the photodiode detector when the light source is switched off, (b) collect a second signal value detected according to light which is scattered by or transmitted through a tissue of a subject and enters the photodiode detector when the light source is switched on, (c) calculate a glucose concentration measurement of the subject by using the first signal value and the second signal value, and (d) adjust an intensity of the light emitted from the light source based on a difference between the glucose concentration measurement and a first reference value.

A non-transitory computer readable recording medium containing program instructions for achieving a method of operating a portable apparatus for noninvasively measuring blood glucose levels, which when executed by a processor, causes the processor to perform the method comprising:

• (a) collecting a first signal value from a photodiode detector when a light source which emits light with a wavelength range to be absorbed into or scattered by glucose is switched off;
• (b) collecting a second signal value according to light which is scattered by or transmitted through a tissue of a subject and enters the photodiode detector when the light source which emits the light with the wavelength range is switched on;
• (c) calculating a glucose concentration measurement of the subject by using the first signal value and the second signal value;
• and
• (d) adjusting an intensity of the light emitted from the light source based on a difference between the glucose concentration measurement and a first reference value.