Development of Portable Non-Invasive Blood Glucose Measuring Device Using NIR Spectroscopy

Diabetes is an incurable disorder which produces various problems related to the body. It is a fast growing disorder, about 500 million people in the world and 50 million people in India are the victims of diabetes. All problems related to diabetes can be reduced through physical exercise, proper and balanced diet, and medication. The current invasive technique which is painful and inconvenient because people have to prick their finger to draw the blood for the measurement of glucose concentration in the blood on a daily basis so it is not recommended for a lifetime. People living in villages (economically poor) do not have facilities to check their blood sugar level regularly because of unavailability of glucose measurement devices and procedural cost. In this paper, absorbance principle is used to propose the non-invasive blood glucose monitoring design aspect. In the spectrometer experiment it has been found that, 940nm wavelength is more precise to detect the glucose concentration. Using Near-Infrared spectroscopy, The IR light passes through the finger, after amplification and filtering we get photo-plethysmograph signal as a result. From the result, we analyze the voltage variations and glucose for different samples and we observed that there is a linear relationship between voltage and glucose concentration. Microcontroller (MSP 430) is further used to display the glucose level on LCD and this data can be sent to the doctors through an android app so that patient can get early medications.