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http://dx.doi.org/10.3807/HKH.2008.19.6.416

Prediction of the Glucose Concentration Based on Its Optical Absorbance at Multiple Discrete Wavelengths  

Kim, Ki-Do (Department of Electronic Engineering, Kwangwoon University)
Son, Geun-Sik (Department of Electronic Engineering, Kwangwoon University)
Lim, Seong-Soo (Department of Electronic Engineering, Kwangwoon University)
Lee, Sang-Shin (Department of Electronic Engineering, Kwangwoon University)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.6, 2008 , pp. 416-421 More about this Journal
Abstract
A scheme for predicting the concentration of a glucose solution based on its relative optical absorbance at multiple probe wavelengths was proposed and verified. The relative absorbance at each of the probe wavelength was obtained with respect to the absorbance at a reference wavelength. The single reference wavelength (1310 nm) and a group of four different probe wavelengths (1064, 1550, 1685, 1798 nm) were selected to exhibit the glucose absorbance with opposite signs, thereby enhancing the accuracy of the prediction. The final glucose concentration was estimated by taking the average of the predicted values provided by the four probe wavelengths. The absorbance of the glucose solution for the path length of 5 mm was $-1.42{\times}10^{-6}\;AU$/(mg/dL) at the reference wavelength of 1310 nm and peaked at $+8.12{\times}10^{-6}\;AU$/(mg/dL) at 1685 nm. The concentration of the glucose solution was decently predicted by means of the proposed scheme with the standard error of prediction of ${\sim}28\;mg/dL$. In addition, the influence of the ambient temperature and the fat thickness upon the prediction of the glucose concentration was examined. The absorption change with the temperature was $-9.1{\times}10^{-5}\;AU/^{\circ}C$ in the temperature range of $26{\sim}40^{\circ}C$ at the reference wavelength, and $-2.08{\times}10^{-2}\;AU/^{\circ}C$ at 1550 nm. And the absorption change with respect to the fat thickness was +1.093 AU/mm at the probe wavelength of 1685 nm.
Keywords
Glucose sensor; Absorption; Absorbance; Spectroscopy; Optical spectrum;
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