Development of NIR Spectroscopy Based Non-invasive Blood Glucose Measuring Device

摘要

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 convenient to use and 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, we propose the non- invasive blood glucose measuring device based on absorption principle. Different wavelengths have experimented to observe the spectral response of light source to glucose samples, it has been found that a 940nm wavelength is more precise and has good sensitivity to the glucose concentration compared to other wavelengths. Using Near-Infrared spectroscopy, the IR light passes through the finger, after amplification and filtering we get a photo-plethysmograph signal as a result. From the result, we analyze the voltage variations and glucose for different samples. It is also observed that there is a nearly linear relationship between voltage and glucose concentration.