Development of an optical system for monitoring urine components-Estimation of accuracy of the system using multi-wavelength LED-

Abstract

We have been developing an optical system for monitoring urinary substances and reported the results of the preliminary experiments using an FT-IR spectrometer for estimating concentration of four urine substances, i.e., glucose, urea, sodium chloride, and creatinine. In this study, we selected four wavelengths sensitive to concentration change in each four component and carried out the multiple regression analysis. As a result, it was confirmed that concentration of the four substances could be predicted with high accuracy (correlation coefficient:γ>0.8) . Also evaluated was the effect of broad emission characteristics of LED on the accuracy of concentration estimation when it was used as a light source. From the results obtained, it was suggested that the multi-wavelength near-infrared LED could be used as a light source for optically monitoring concentration of the four components.